没有声音的支持。
There has been no mention of video or audio, and there's a good reason.
没有涉及到视频或音频，之所以这样做，有一个很好的理由。
If there's no receiving video phone, then a normal audio call can take place.
如果对方不是可视接收电话，那也可进行有声通话。
There's no voice recognition tutorial, and the audio quality is very good.
有没有语音识别教程，和音频质量非常好。
There's no voice recognition tutorial, and the audio quality is very good.
有没有语音识别教程，和音频质量非常好。
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