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。
youdao
I'm still fast-forwarding. This is recorded playback.
我一直在快速向前翻动画面，这是录像重放。
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模块上移
模块下移
不移动