If set, this marks a point in the task's activity stack that should be cleared when the task is reset.
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。
The root activity in the stack is the one that began the task — typically, it's an activity the user selected in the application launcher.
栈中最底部的是任务的起始活动——一般是用户在滑出的程序列表中选择启动的活动。
When the user presses the BACK key, the current activity is popped from the stack, and the previous one resumes as the running activity.
当用户按下BACK键后，正在运行的活动被弹出栈，旧一个恢复成为正在运行的活动。
The activity at the top of the stack is one that's currently running - the one that is the focus for user actions.
最顶部的是正在运行的活动——用户正在关注操作的。
The activity at the top of the stack is one that's currently running - the one that is the focus for user actions.
最顶部的是正在运行的活动——用户正在关注操作的。
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