简而言之，Listen将全世界的音频信息整理起来，并让这些信息在任何时间，任何地点为人们提供便利。
In short, Listen helps organize the world of audio information and makes it easily accessible anytime, anywhere.
预先录制好的纯视频：为预先录制好的纯音频内容提供一个用于展示等价信息的的基于时间的媒体或者音轨的替代方案。
Prerecorded video-only: Either an alternative for time-based media or an audio track is provided that presents equivalent information for prerecorded video-only content.
信息通过时间戳编码，主要是关于解码以及显示音频和视频数据，时间戳是关于数据流本身。
Information is coded in the syntax using time stamps concerning the decoding and presentation of coded audio and visual data and time stamps concerning the delivery of the data stream itself.
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