Microsoft Speech SDK
http://msdn.microsoft.com/en-us/library/aa920210.aspx
只是为了简单的t2s,它应该非常简单,就像
SpVoice objSpeech = new SpVoice();
objSpeech.Speak("Hello world",SpeechVoiceSpeakFlags.SVSFlagsAsync);
objSpeech.WaitUntilDone(Timeout.Infinite);
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