为了公开元素映射，可以为每个元素增加一个属性用于展示其到一般元素类型的映射。

To expose the element mappings, you can add an attribute to each element that shows its mappings to more general types.

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不同于XML, vcard格式是扁平文本，就是说不能直接向各种元素增加信息。

Unlike XML, the vCard format is flat file, which means that you cannot directly attach information to different elements.

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XForms 采用 XML Events 标准为特定文档元素增加事件处理程序。

XForms uses the XML Events standard to attach event handlers to specific elements in a document.

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So they'd much rather just stay the way they are and not have another electron come on, and it turns out that halogens have the highest electron affinities.

所以它们更愿意保持在原来的状态,不愿意再增加一个电子,结果卤族元素具有最高的电子亲和能。

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