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.
测试通过点击在时间轴播放按钮。
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.
如果一个时间轴已经在播放了，它会被立即停止。
If a timeline is currently playing it will be immediately stopped when calling this method.
如果一个时间轴已经在播放了，它会被立即停止。
If a timeline is currently playing it will be immediately stopped when calling this method.
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