注意，按键值相关的表可以嵌套，如清单5中所示，或者由嵌入在文档中的链接引用为相关表名称上的属性。
Note that tables related by key can be nested, as in Listing 5, or referenced by a link embedded within the document as attributes on the related table name.
当鼠标按键释放后，按钮就被触发，与之相关的动作就会出现。
When the mouse button is released, the button is triggered, and its associated action occurs.
当鼠标按键释放后，按钮就被触发，与之相关的动作就会出现。
When the mouse button is released, the button is triggered, and its associated action occurs.
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