学员提交的录音，部分手机会有最后几个单词的读音会听不到

https://cdn-qiye-voice.jingdaka.com/backend_voice/2019/04/10/37cfeedf-41a8-cd19-e812-82689fb97433.mp3

"system_info": "{\"locationEnabled\":true,\"screenWidth\":360,\"screenHeight\":680,\"windowHeight\":608,\"bluetoothEnabled\":false,\"language\":\"en\",\"microphoneAuthorized\":true,\"version\":\"7.0.3\",\"cameraAuthorized\":true,\"system\":\"Android 9\",\"fontSizeSetting\":16,\"locationAuthorized\":true,\"pixelRatio\":3,\"notificationAuthorized\":true,\"model\":\"BKL-AL20\",\"statusBarHeight\":24,\"deviceOrientation\":\"portrait\",\"wifiEnabled\":true,\"brand\":\"HONOR\",\"windowWidth\":360,\"platform\":\"android\",\"SDKVersion\":\"2.6.5\"}",