You can add audio, text and even photo on your specified location.
你可以在你指定的位置上添加声音，文字，甚至照片。
If a slide contains video closed captions and then you add audio closed captions, the latter takes precedence.
如果幻灯片包含视频式隐藏式字幕，并且你添加了声音隐藏式字幕，则后者优先。
If a slide contains video closed captions and then you add audio closed captions, the latter takes precedence.
如果幻灯片包含视频式隐藏式字幕，并且你添加了声音隐藏式字幕，则后者优先。
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