For each node in the tree, define a hyperlink that, if clicked on by the user, signals to the Discovery to apply a metadata condition.

对于树中的每个节点，都定义了一个超级链接，如果用户单击该链接，就会向Discovery发送应用一个元数据条件的信号。

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So if you haven't clicked in yet, or if you want to change your answer, keep in mind that you might need to jot down, - for example, a Lewis structure before you can answer this question.

如果你还没有点答案，或者你想改变你的答案，记住你也许需要在回答问题前写点东西，比如画一画Lewis结构,来得到最终。

麻省理工公开课 - 化学原理课程节选

Even if you clicked in just to rail about Anthony or bought the newspaper to burn it, you gave her value.

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Apparently, advertisers still believe if you see their ad in print it is worth way more than if you clicked their ad while online.

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If a person clicked on the ad, it would prompt the user to download or use the Expedia app to book the transaction.

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