浏览一下这些数据，看你是否能获得让你的视频发挥更多作用的理解，视频的最佳长度是多少，除了你自己网络之外有多大的网络覆盖范围。

Take a look at this data and see if you can gather any insights about which video content works best, what is the optimal length, and how much coverage your video received beyond your own network.

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许多作者更喜欢用“协会”而不是“社区”这个词来强调这种相互作用的松散性。

Many authors prefer the term "association" to the term "community" in order to stress the looseness of the interaction.

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无线电广播，尤其电视已代替了曾经由印刷所起的许多作用。

Radio and especially television have taken over many of the functions once served by print.

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But do you know what the force on the body is?

但你知道物体受到了多大力的作用吗

耶鲁公开课 - 基础物理课程节选