If time and place allow, consider and prepare audio-visual aids.
如果时间和地点允许的话，考虑并准备好视听教具。
But listening to every extracted audio track is a waste of time.
不过，听每提取的音轨是时间的浪费。
RTP is an Internet protocol for the transport of real-time data, e. g. audio and video.
RTP是传输实时传输(比如音频和视频)的一种互联网协议。
RTP is an Internet protocol for the transport of real-time data, e. g. audio and video.
RTP是传输实时传输(比如音频和视频)的一种互联网协议。
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