add chinese subtitles

android/oral-trainer-sdk/src/main/java/cn/learningpad/oraltrainer/sdk/SentenceBoundaryApi.kt

@@ -159,6 +159,11 @@ class SentenceBoundaryApi internal constructor(
                         } else {
                             sentence.getLong("reference_speech_duration_ms")
                         },
+                        zhText = if (sentence.isNull("zh_text")) {
+                            null
+                        } else {
+                            sentence.getString("zh_text").takeIf { it.isNotBlank() }
+                        },
                     )
                 )
             }

android/oral-trainer-sdk/src/main/java/cn/learningpad/oraltrainer/sdk/TrainingModels.kt

@@ -10,6 +10,7 @@ data class SentenceBoundary @JvmOverloads constructor(
     val text: String? = null,
     val language: String? = null,
     val referenceSpeechDurationMs: Long? = null,
+    val zhText: String? = null,
 ) {
     init {
         require(index >= 0) { "Sentence index must be non-negative." }