这样，就可以为文件类型中已经应用的扩展做一个提示符，您就可以轻松识别出稍后需要清除的文件。
This will keep the already applied extension as a reminder for the document type, and you can easily identify which files you need to remove later on.
当你做一个月的定期运动之后，你的身体会清除那些多余的脂肪，让你身体的肌肉增多。
When you do one month of regular exercise, your body ditches those excess fats and gains muscle.
设置这个标志意味着在activity栈中做一个标记，在Task重置的时候栈就把从标记往上的activity都清除。
If set, this marks a point in the task's activity stack that should be cleared when the task is reset.
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