无论您何时更改文件，您都可以通过在签出时声明一个活动来确认您进行更改的原因。
Whenever you change a file, you identify the reason you are making that change by declaring an activity at checkout time.
获取所选活动文件的URL。
图标文件定义活动所用的映像。
The icon file defines the image that's used for the activity.
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