当他们在操场或其他地方四处走动时，文本、视频或音频会在不同的地方弹出来，以帮他们弄清楚为什么会有外星人出现在校园里。
As they walk around a playground or other area, text, video or audio pops up at various points to help them try to figure out why aliens were in the schoolyard.
将剪裁后的视频或音频剪辑重置为原始大小。
控制动态web页面特性，比如播放和暂停视频或音频。
Controlling dynamic Web page features, such as playing and pausing audio or video.
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