future-activity stack 未来动作栈
current activity stack 现行活动堆栈
stack air activity release 烟囱空气放射性释放
activity discharge at the stack 从烟囱排放的放射性 ; 从烟囱排放的放射性物质
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。
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