The TTS engine provides the pronunciation, thus giving you a good start at what the TTS engine might think the word should sound like.
TTS 引擎提供发音，这样就给您开了个好头，使您能够知道 TTS 引擎认为这些词应该如何发音。
2
There is only one TTS engine in this context so there's no attribute to specify which engine to use.
此环境中只有一个 TTS 引擎，所以不需要用属性来指定使用哪个引擎。
3
When speaking specific data types it can help to tell the text-to-speech (TTS) system of the voice browser the type of information to convert into speech.