This activity should include all the code related to the system, regardless of what component or interface a programmer is working on.
这一行为应该包括相关系统的全部代码，不论程序员工作于什么组件或接口上。
This flag is not normally set by application code, but set for you by the system if this activity is being launched from history (longpress home key).
这个标志通常情况下不会通过应用的代码来设置，而是在通过最近任务启动activity时由系统设置的。
This flag is not normally set by application code, but set for you by the system if this activity is being launched from history (longpress home key).
这个标志通常情况下不会通过应用的代码来设置，而是在通过最近任务启动activity时由系统设置的。
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