The control panel, when visible, enables the user to control the playback (start, stop, pause, mute, and so on).
当控制面板可视的时候，可以让用户控制回放(启动、停止、暂停、静音等)。
Call start to begin playback and drain to wait until the playback is complete, and close to release the audio line.
调用start开始播放，drain等待播放完成，close释放音频线路。
The media stream can be fast-forwarded or rewound, and playback can start at any point in the media.
媒体流可以快进或后退，回放可以在媒体的任何一点开始。
The media stream can be fast-forwarded or rewound, and playback can start at any point in the media.
媒体流可以快进或后退，回放可以在媒体的任何一点开始。
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