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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无论哪种情况，元素都应该在title属性中包含人类可读的值。

In both cases, the element should also contain a human readable value in the title attribute. For example.

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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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