The first line changes the button's label to show the selected label in the pull-down menu.

第一行代码更改按钮的标签，以在下拉菜单中显示选择的标签。

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In fact, in the time it takes you to investigate which files have that label, the label can, in the meantime, be attached to new files, moved to new versions, or removed from selected files.

实际上，这告诉你调查哪些文件有这些标签，同时，标签能够关联到新的文件，移动到新版本，或者从选定的文件删除。

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These extension points define the label for the actions and point the platform to the code that runs when the actions are selected from the menu.

这些扩展点定义动作的标签，并将平台指向当从菜单中选择动作时所运行的代码。

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