diff --git a/app/src/main/java/com/bnyro/translate/api/deepl/DeeplEngine.kt b/app/src/main/java/com/bnyro/translate/api/deepl/DeeplEngine.kt
index d0e8ceabb..7d3209a32 100644
--- a/app/src/main/java/com/bnyro/translate/api/deepl/DeeplEngine.kt
+++ b/app/src/main/java/com/bnyro/translate/api/deepl/DeeplEngine.kt
@@ -104,11 +104,16 @@ class DeeplEngine : TranslationEngine(
         }
 
     override suspend fun translate(query: String, source: String, target: String): Translation {
+        val convertedTarget = when(target){
+            "zh-Hant", "zh-Hans" -> "zh"
+            else -> target
+        }
+        
         if (getApiKey().isNotEmpty()) {
             val response = api.translate(
                 apiKeyString,
                 sourceOrAuto(source.uppercase()),
-                target.uppercase(),
+                convertedTarget.uppercase(),
                 query
             )
 
@@ -130,7 +135,7 @@ class DeeplEngine : TranslationEngine(
                         ),
                         splitting = "newlines",
                         lang = DeeplWebTranslationRequestParamsLang(
-                            targetLang = target.uppercase(),
+                            targetLang = convertedTarget.uppercase(),
                             sourceLangUserSelected = sourceOrAuto(source.uppercase()).ifEmpty { "auto" },
                             preference = DeeplWebTranslationRequestParamsLangPreference(
                                 weight = emptyMap()
diff --git a/app/src/main/java/com/bnyro/translate/api/gl/GlEngine.kt b/app/src/main/java/com/bnyro/translate/api/gl/GlEngine.kt
index 87f7708ae..2cc166a86 100644
--- a/app/src/main/java/com/bnyro/translate/api/gl/GlEngine.kt
+++ b/app/src/main/java/com/bnyro/translate/api/gl/GlEngine.kt
@@ -260,8 +260,15 @@ class GlEngine : TranslationEngine(
         ).map { Language(it.first.trim(), it.second) }
     }
 
+    protected fun convertLanguageCode(languageCode: String): String {
+        return when(languageCode){
+            "zh-Hant", "zh-Hans" -> "zh"
+            else -> languageCode
+        }
+    }
+
     override suspend fun translate(query: String, source: String, target: String): Translation {
-        val translation = api.translate(source, target, query)
+        val translation = api.translate(convertLanguageCode(source), convertLanguageCode(target), query)
         return Translation(translation.translation)
     }
 }
diff --git a/app/src/main/java/com/bnyro/translate/api/lv/LVEngine.kt b/app/src/main/java/com/bnyro/translate/api/lv/LVEngine.kt
index 9e5a760bf..b97cbb823 100644
--- a/app/src/main/java/com/bnyro/translate/api/lv/LVEngine.kt
+++ b/app/src/main/java/com/bnyro/translate/api/lv/LVEngine.kt
@@ -46,10 +46,17 @@ class LVEngine : TranslationEngine(
         }
     }
 
+    protected fun convertLanguageCode(languageCode: String): String {
+        return when(languageCode){
+            "zh-Hant", "zh-Hans" -> "zh"
+            else -> languageCode
+        }
+    }
+
     override suspend fun translate(query: String, source: String, target: String): Translation {
         val response = api.translate(
-            sourceOrAuto(source),
-            target,
+            convertLanguageCode(sourceOrAuto(source)),
+            convertLanguageCode(target),
             query.replace("/", "")
         )
         return Translation(
diff --git a/app/src/main/java/com/bnyro/translate/api/mh/MhEngine.kt b/app/src/main/java/com/bnyro/translate/api/mh/MhEngine.kt
index fa7142077..a6e77fcca 100644
--- a/app/src/main/java/com/bnyro/translate/api/mh/MhEngine.kt
+++ b/app/src/main/java/com/bnyro/translate/api/mh/MhEngine.kt
@@ -58,12 +58,20 @@ class MhEngine : TranslationEngine(
             .map { Language(it.id, it.name) }
     }
 
+    protected fun convertLanguageCode(languageCode: String): String {
+        return when(languageCode){
+            "zh-Hant" -> "zh-TW"
+            "zh-Hans" -> "zh-CN"
+            else -> languageCode
+        }
+    }
+
     override suspend fun translate(query: String, source: String, target: String): Translation {
         val response = api.translate(
             engine = getSelectedEngine(),
-            source = sourceOrAuto(source.take(2)),
+            source = convertLanguageCode(sourceOrAuto(source)),
             query = query,
-            target = target.take(2),
+            target = convertLanguageCode(target),
         )
         return Translation(
             translatedText = response.translatedText,
diff --git a/app/src/main/java/com/bnyro/translate/api/wm/WmEngine.kt b/app/src/main/java/com/bnyro/translate/api/wm/WmEngine.kt
index fe22fbf04..820edb2b3 100644
--- a/app/src/main/java/com/bnyro/translate/api/wm/WmEngine.kt
+++ b/app/src/main/java/com/bnyro/translate/api/wm/WmEngine.kt
@@ -50,8 +50,15 @@ class WmEngine : TranslationEngine(
         }
     }
 
+    protected fun convertLanguageCode(languageCode: String): String {
+        return when(languageCode){
+            "zh-Hant", "zh-Hans" -> "zh"
+            else -> languageCode
+        }
+    }
+
     override suspend fun translate(query: String, source: String, target: String): Translation {
-        val response = api.translate(source, target, WmTranslationRequest(query))
+        val response = api.translate(convertLanguageCode(source), convertLanguageCode(target), WmTranslationRequest(query))
         return Translation(response.translation)
     }
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/bnyro/translate/api/ya/YandexEngine.kt b/app/src/main/java/com/bnyro/translate/api/ya/YandexEngine.kt
index e3f69541d..386135765 100644
--- a/app/src/main/java/com/bnyro/translate/api/ya/YandexEngine.kt
+++ b/app/src/main/java/com/bnyro/translate/api/ya/YandexEngine.kt
@@ -47,8 +47,17 @@ class YandexEngine : TranslationEngine(
         ).map { (key, value) -> Language(code = key, name = value) }
     }
 
+    protected fun convertLanguageCode(languageCode: String): String {
+        return when(languageCode){
+            "zh-Hant", "zh-Hans" -> "zh"
+            else -> languageCode
+        }
+    }
+
     override suspend fun translate(query: String, source: String, target: String): Translation {
-        val lang = if (source.isEmpty()) target else "$source-$target"
+        val convertedSource = convertLanguageCode(source)
+        val convertedTarget = convertLanguageCode(target)
+        val lang = if (convertedSource.isEmpty()) convertedTarget else "$convertedSource-$convertedTarget"
 
         val uuid = UUID.randomUUID().toString().replace("-", "") + "-0-0"
         val response = api.translate(lang, query, "android", uuid)
diff --git a/app/src/main/java/com/bnyro/translate/ui/components/LanguageSelectionComponent.kt b/app/src/main/java/com/bnyro/translate/ui/components/LanguageSelectionComponent.kt
index 97a3f3611..b981803d6 100644
--- a/app/src/main/java/com/bnyro/translate/ui/components/LanguageSelectionComponent.kt
+++ b/app/src/main/java/com/bnyro/translate/ui/components/LanguageSelectionComponent.kt
@@ -137,12 +137,9 @@ fun LanguageSelectionComponent(viewModel: TranslationModel) {
 @Composable
 fun SwapLanguagesButton(viewModel: TranslationModel) {
     val context = LocalContext.current
-
-    val switchBtnEnabled = viewModel.sourceLanguage.code.isNotEmpty()
-
     IconButton(
         onClick = {
-            if (switchBtnEnabled) viewModel.swapLanguages(context)
+            viewModel.swapLanguages(context)
         }
     ) {
         Icon(
@@ -150,7 +147,7 @@ fun SwapLanguagesButton(viewModel: TranslationModel) {
             null,
             modifier = Modifier
                 .size(18.dp),
-            tint = if (switchBtnEnabled) MaterialTheme.colorScheme.onSurface else Color.Gray
+            tint = MaterialTheme.colorScheme.onSurface
         )
     }
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/bnyro/translate/ui/components/TranslationField.kt b/app/src/main/java/com/bnyro/translate/ui/components/TranslationField.kt
index 87807bb56..6f5c5207c 100644
--- a/app/src/main/java/com/bnyro/translate/ui/components/TranslationField.kt
+++ b/app/src/main/java/com/bnyro/translate/ui/components/TranslationField.kt
@@ -20,18 +20,21 @@ package com.bnyro.translate.ui.components
 import android.content.Intent
 import android.os.Handler
 import android.os.Looper
+import android.util.Log
 import androidx.compose.animation.AnimatedVisibility
 import androidx.compose.animation.expandVertically
 import androidx.compose.animation.shrinkVertically
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.ContentCopy
 import androidx.compose.material.icons.filled.DoneAll
 import androidx.compose.material.icons.filled.Share
 import androidx.compose.material.icons.filled.VolumeUp
 import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
@@ -43,11 +46,15 @@ import androidx.compose.ui.platform.LocalClipboardManager
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.AnnotatedString
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
 import com.bnyro.translate.R
 import com.bnyro.translate.db.obj.Language
+import com.bnyro.translate.obj.Translation
 import com.bnyro.translate.ui.models.TranslationModel
 import com.bnyro.translate.util.Preferences
 import com.bnyro.translate.util.SpeechHelper
+import com.bnyro.translate.util.TranslationEngine
 
 @Composable
 fun TranslationField(
@@ -57,6 +64,7 @@ fun TranslationField(
     language: Language,
     setLanguage: (Language) -> Unit = {},
     showLanguageSelector: Boolean = false,
+    translationEngine: TranslationEngine = translationModel.engine,
     onTextChange: (String) -> Unit = {}
 ) {
     val context = LocalContext.current
@@ -70,8 +78,13 @@ fun TranslationField(
         Preferences.get(Preferences.charCounterLimitKey, "")
     }
 
+    val translationModelTranslation: Translation = translationModel
+        .translatedTexts[translationEngine.name]?:Translation("")
+    val inverseTranslationModelTranslation: Translation = translationModel
+        .inverseTranslatedTexts[translationEngine.name]?:Translation("")
+
     AnimatedVisibility(
-        visible = text.isNotEmpty(),
+        visible = text.isNotEmpty() || !isSourceField,  // 翻譯欄位總是顯示，但源欄位只在有內容時顯示按鈕
         enter = expandVertically(),
         exit = shrinkVertically(),
         label = "text actions fade"
@@ -84,7 +97,7 @@ fun TranslationField(
                 LanguageSelector(
                     translationModel.availableLanguages,
                     language,
-                    autoLanguageEnabled = translationModel.engine.autoLanguageCode != null && isSourceField,
+                    autoLanguageEnabled = translationEngine.autoLanguageCode != null && isSourceField,
                     viewModel = translationModel,
                     useElevatedButton = false
                 ) {
@@ -93,6 +106,19 @@ fun TranslationField(
                 }
             }
 
+            if (!isSourceField){
+                Text(
+                    modifier = Modifier.padding(
+                        top = 20.dp,
+                        bottom = 10.dp,
+                        start = 15.dp
+                    ),
+                    text = translationEngine.name,
+                    color = MaterialTheme.colorScheme.primary,
+                    fontSize = 14.sp
+                )
+            }
+
             Spacer(modifier = Modifier.weight(1f))
 
             if (isSourceField && showLanguageSelector) {
@@ -128,7 +154,7 @@ fun TranslationField(
                 }
             )
 
-            if (translationModel.engine.supportsAudio && language.code.isNotEmpty()) {
+            if (translationEngine.supportsAudio && language.code.isNotEmpty()) {
                 StyledIconButton(
                     imageVector = Icons.Default.VolumeUp
                 ) {
@@ -145,11 +171,11 @@ fun TranslationField(
     }
 
     StyledTextField(
-        text = text + (if (!isSourceField) "\n\n\n" else ""),
+        text = text + (if (!isSourceField) "" else ""),
         placeholder = if (isSourceField) stringResource(R.string.enter_text) else null,
         readOnly = !isSourceField,
         textColor = if (
-            charPref.isNotEmpty() && translationModel.translation.translatedText.length >= charPref.toInt()
+            charPref.isNotEmpty() && translationModelTranslation.translatedText.length >= charPref.toInt()
         ) {
             MaterialTheme.colorScheme.error
         } else {
@@ -158,4 +184,17 @@ fun TranslationField(
     ) {
         onTextChange(it)
     }
+    
+    if (!isSourceField){
+        Text(
+            modifier = Modifier.padding(
+                top = 0.dp,
+                bottom = 10.dp,
+                start = 15.dp
+            ),
+            text = inverseTranslationModelTranslation.translatedText,
+            color = MaterialTheme.colorScheme.secondary,
+            fontSize = 12.sp
+        )
+    }
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/bnyro/translate/ui/models/TranslationModel.kt b/app/src/main/java/com/bnyro/translate/ui/models/TranslationModel.kt
index abe2e50cb..124faca7c 100644
--- a/app/src/main/java/com/bnyro/translate/ui/models/TranslationModel.kt
+++ b/app/src/main/java/com/bnyro/translate/ui/models/TranslationModel.kt
@@ -47,6 +47,9 @@ import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
+import kotlinx.serialization.encodeToString
+import androidx.compose.runtime.mutableStateMapOf
+import com.bnyro.translate.ext.toastFromMainThread
 
 class TranslationModel : ViewModel() {
     var engine by mutableStateOf(getCurrentEngine())
@@ -70,9 +73,9 @@ class TranslationModel : ViewModel() {
 
     var translation by mutableStateOf(Translation(""))
 
-    var translatedTexts = TranslationEngines.engines
-        .associate { it.name to Translation("") }
-        .toMutableMap()
+    var translatedTexts = mutableStateMapOf<String, Translation>()
+    
+    var inverseTranslatedTexts = mutableStateMapOf<String, Translation>()
 
     var bookmarkedLanguages by mutableStateOf(listOf<Language>())
 
@@ -85,6 +88,15 @@ class TranslationModel : ViewModel() {
     private var mediaPlayer: MediaPlayer? = null
     private var audioFile: File? = null
 
+    fun detectedLanguageMostly(): String?{
+        val detectedLanguageList = translatedTexts.filter {
+            it.value.detectedLanguage != null
+        }
+        return detectedLanguageList.maxByOrNull {
+            it.value.detectedLanguage?:""
+        }?.value?.detectedLanguage
+    }
+
     private fun getLanguageByPrefKey(key: String): Language? {
         return runCatching {
             JsonHelper.json.decodeFromString<Language>(Preferences.get(key, ""))
@@ -117,10 +129,8 @@ class TranslationModel : ViewModel() {
 
         translating = true
 
-        translatedTexts = TranslationEngines.engines
-            .associate { it.name to Translation("") }
-            .toMutableMap()
-
+        translatedTexts.clear()
+        TranslationEngines.engines.forEach { translatedTexts[it.name] = Translation("") }
         viewModelScope.launch(Dispatchers.IO) {
             val translation = try {
                 engine.translate(
@@ -132,7 +142,7 @@ class TranslationModel : ViewModel() {
                 Log.e("error", e.message.toString())
                 _apiError.emit(e)
                 translating = false
-                return@launch
+                Translation("")
             }
             translating = false
 
@@ -160,6 +170,19 @@ class TranslationModel : ViewModel() {
                             sourceLanguage.code,
                             targetLanguage.code
                         )
+                        //if sourceLanguage "auto" use detectedLanguage
+                        val sourceLanguageCode = if(sourceLanguage.code == ""){
+                            val detectedLanguage = translatedTexts[it.name]?.detectedLanguage
+                            if (detectedLanguage == "" || detectedLanguage == null){
+                                detectedLanguageMostly()
+                            }else{ detectedLanguage }?:""
+                        } else { sourceLanguage.code }
+
+                        inverseTranslatedTexts[it.name] = it.translate(
+                            translatedTexts[it.name]?.translatedText?:return@runCatching,
+                            targetLanguage.code,
+                            sourceLanguageCode
+                        )
                     }
                 }
             }
@@ -281,7 +304,10 @@ class TranslationModel : ViewModel() {
     fun swapLanguages(context: Context) {
         if (availableLanguages.isEmpty()) return
 
-        val temp = sourceLanguage
+        val temp = if(sourceLanguage.code == ""){
+            availableLanguages.find { it.code == detectedLanguageMostly() }
+                ?:Language("en", "English")
+        } else { sourceLanguage }
         sourceLanguage = targetLanguage
         targetLanguage = temp
 
diff --git a/app/src/main/java/com/bnyro/translate/ui/views/TranslationComponent.kt b/app/src/main/java/com/bnyro/translate/ui/views/TranslationComponent.kt
index 3324aadfa..6b62ff19c 100644
--- a/app/src/main/java/com/bnyro/translate/ui/views/TranslationComponent.kt
+++ b/app/src/main/java/com/bnyro/translate/ui/views/TranslationComponent.kt
@@ -20,16 +20,21 @@ package com.bnyro.translate.ui.views
 import android.content.ClipData
 import android.content.ClipboardManager
 import android.os.Build
+import android.util.Log
+import androidx.compose.foundation.background
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxHeight
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.foundation.verticalScroll
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.ArrowUpward
@@ -41,8 +46,7 @@ import androidx.compose.material3.HorizontalDivider
 import androidx.compose.material3.Icon
 import androidx.compose.material3.LinearProgressIndicator
 import androidx.compose.material3.MaterialTheme
-import androidx.compose.material3.SnackbarHostState
-import androidx.compose.material3.SnackbarResult
+import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
@@ -52,17 +56,18 @@ import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.platform.LocalClipboardManager
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.unit.dp
 import androidx.core.content.ContextCompat
-import androidx.navigation.NavController
 import com.bnyro.translate.R
+import com.bnyro.translate.obj.Translation
 import com.bnyro.translate.ui.components.ButtonWithIcon
 import com.bnyro.translate.ui.components.TranslationField
 import com.bnyro.translate.ui.models.TranslationModel
-import com.bnyro.translate.ui.nav.Destination
 import com.bnyro.translate.util.Preferences
 import kotlinx.coroutines.launch
 
@@ -184,19 +189,24 @@ fun TranslationComponent(
                 }
             }
 
-            TranslationField(
-                translationModel = viewModel,
-                isSourceField = false,
-                text = viewModel.translation.translatedText,
-                language = viewModel.targetLanguage,
-                showLanguageSelector = showLanguageSelector,
-                setLanguage = {
-                    if (it == viewModel.sourceLanguage) {
-                        viewModel.sourceLanguage = viewModel.targetLanguage
+            val enabledEngines = viewModel.enabledSimEngines
+            for (enabledEngine in enabledEngines){
+                val translatedText = viewModel.translatedTexts[enabledEngine.name]?.translatedText?:""
+                TranslationField(
+                    translationModel = viewModel,
+                    isSourceField = false,
+                    text = translatedText,
+                    language = viewModel.targetLanguage,
+                    showLanguageSelector = showLanguageSelector,
+                    translationEngine = enabledEngine,
+                    setLanguage = {
+                        if (it == viewModel.sourceLanguage) {
+                            viewModel.sourceLanguage = viewModel.targetLanguage
+                        }
+                        viewModel.targetLanguage = it
                     }
-                    viewModel.targetLanguage = it
-                }
-            )
+                )
+            }
         }
 
         if (scrollState.value > 100) {