diff --git a/src/Sound/voice.cxx b/src/Sound/voice.cxx
index 63037ee..cfc82e8 100644
--- a/src/Sound/voice.cxx
+++ b/src/Sound/voice.cxx
@@ -127,9 +127,6 @@ void FGVoiceMgr::shutdown()
 void FGVoiceMgr::update(double dt)
 {
 
-	SG_LOG(SG_SOUND, SG_INFO, "FGVoice::update " << dt  );
-
-
 	if (!_enabled)
 		return;
 
@@ -221,6 +218,7 @@ bool FGVoiceMgr::FGVoice::speak(void)
   const string s = _msg.front();
   _msg.pop();
 
+  //zhongjin 播放语音
   speak(s);
 
   return !_msg.empty();