播放时间轴可以让我们的观众添加注释、标签，并在需要的地方跳过幻灯片。

The presentation time line allows our viewers to add comments and tags and skip slides where needed.

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测试通过点击在时间轴播放按钮。

Test it by hitting the play button at the timeline.

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你可以把多条时间轴链接起来并播放。你也可以利用这个功能来自动地循环播放一条时间轴。

You can automatically play back a sequence of timelines by chaining them. You can also use this feature for automatically looping a timeline.

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