diff --git a/app/src/main/java/com/k2fsa/sherpa/onnx/MainActivity.kt b/app/src/main/java/com/k2fsa/sherpa/onnx/MainActivity.kt
index 09dd300..2336e2c 100644
--- a/app/src/main/java/com/k2fsa/sherpa/onnx/MainActivity.kt
+++ b/app/src/main/java/com/k2fsa/sherpa/onnx/MainActivity.kt
@@ -309,11 +309,12 @@ class MainActivity : AppCompatActivity() {
     // KV 污染 workaround(2026-09-14,不改 .so):nativeGenerate 不清 KV,
     // 同引擎连续 generate 会复读上一条 → 每"批"generate 前重建引擎。
     // 初译从逐句改为小批量编号翻译(凑 4 句或 2.5s 定时封批)。
-    private val initialBatchMax = 2   // 4 句批后期句常退化成抄原文;2 句批明显更稳
+    private val initialBatchMax = 1   // 逐句直出:多句JSON批的格式/复读风险一并消除
     private val initialBatchDelayMs = 2_500L
     private val initialPending = ArrayList<Pair<Long, String>>()
     private var initialBatchTimer: Runnable? = null
     private val translatedSids = HashSet<Long>()                    // 每槽只翻一次
+    private val retriedSids = HashSet<Long>()                       // 失败仅重试一次
 
     companion object {
         private val SUMMARY_THREADS = 6          // 空闲时:大核全用
@@ -1939,10 +1940,13 @@ class MainActivity : AppCompatActivity() {
             uiHandler.post {
                 val touched = HashSet<SubtitleLine>()
                 refs.forEach { s2 ->
-                    map[s2.id.toString()]?.takeIf {
-                        it.isNotBlank() && !isEcho(s2.text, it)
-                    }?.let { tr ->
-                        if (s2.trans != tr) {
+                    val tr = map[s2.id.toString()]
+                    when {
+                        tr == null || tr.isBlank() ->
+                            Log.i(TAG, "MISS sid=${$}s2.id}'} reason=seg-empty")
+                        isEcho(s2.text, tr, echoJaccardTh(s2.text)) ->
+                            Log.i(TAG, "MISS sid=${$}s2.id}'} reason=seg-echo")
+                        else -> if (s2.trans != tr) {
                             s2.trans = tr
                             s2.line?.let { touched.add(it) }
                         }
@@ -2020,14 +2024,29 @@ class MainActivity : AppCompatActivity() {
             val map = translateNumbered(batch.map {
                 Pair(it.first.toString(), it.second)
             })
-            if (map == null || !plausibleTranslations(map.values)) return@post
+            if (map == null || !plausibleTranslations(map.values)) {
+                Log.i(TAG, "MISS reason=genfail sids=" +
+                        batch.joinToString(",") { it.first.toString() })
+                // 失败自动重试一次(仅一次;判重在主线程做,避免竞态)
+                uiHandler.post {
+                    val retry = batch.filter { retriedSids.add(it.first) }
+                    if (retry.isNotEmpty()) {
+                        initialPending.addAll(retry)
+                        flushInitialBatch()
+                    }
+                }
+                return@post
+            }
             uiHandler.post {
                 val touched = HashSet<SubtitleLine>()
                 batch.forEach { (sid, src) ->
-                    map[sid.toString()]?.takeIf {
-                        it.isNotBlank() && !isEcho(src, it)
-                    }?.let { tr ->
-                        findSentence(sid)?.let { s2 ->
+                    val tr = map[sid.toString()]
+                    when {
+                        tr == null || tr.isBlank() ->
+                            Log.i(TAG, "MISS sid=$sid reason=empty")
+                        isEcho(src, tr, echoJaccardTh(src)) ->
+                            Log.i(TAG, "MISS sid=$sid reason=echo")
+                        else -> findSentence(sid)?.let { s2 ->
                             if (s2.trans != tr) {
                                 s2.trans = tr
                                 s2.line?.let { touched.add(it) }
@@ -2107,7 +2126,15 @@ class MainActivity : AppCompatActivity() {
     private fun normalizeForEcho(x: String): String =
         x.lowercase().filter { it.isLetterOrDigit() || it.code >= 0x3040 }
 
-    private fun isEcho(src: String, tr: String): Boolean {
+    // 日↔中互译共享汉字,正常译文的二元组重合本来就高 → 该方向阈值放宽到
+    // 0.88(只抓真抄写);其他方向维持 0.72。修"isEcho 错杀正常翻译"的漏句。
+    private fun echoJaccardTh(srcText: String): Double {
+        val d = SummarizePipeline.detectLanguage(srcText)
+        val t = uiLanguage()
+        return if ((d == "ja" || d == "zh") && (t == "ja" || t == "zh")) 0.88 else 0.72
+    }
+
+    private fun isEcho(src: String, tr: String, th: Double = 0.72): Boolean {
         val a = normalizeForEcho(src)
         val b = normalizeForEcho(tr)
         if (a.isEmpty() || b.isEmpty()) return false
@@ -2123,7 +2150,7 @@ class MainActivity : AppCompatActivity() {
         if (ba.isEmpty() || bb.isEmpty()) return false
         val inter = bb.count { ba.contains(it) }
         val union = ba.size + bb.size - inter
-        return union > 0 && inter.toDouble() / union >= 0.72
+        return union > 0 && inter.toDouble() / union >= th
     }
 
     private val unloadRunnable = Runnable {