类似地，需求也有属性——这是使需求更为可读和可用的信息。

Similarly, requirements have attributes — information that makes the requirements more understandable or usable.

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第四个参数使您可以访问事件的可读属性，用第三个参数传递的值设置可写属性。

The fourth argument allows you to access a readable property of the incoming event to set the writeable property passed in as the third argument.

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XML 在一个层次结构中表示信息，该结构的元素和属性一般用可读性很强的语言编写。

XML presents information in a hierarchical structure with elements and attributes usually written in easy-to-read language.

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