As we click around in the application, new events will be pushed onto the top of the stack, and the pointer will identify the last element added.

当我们在应用程序中单击的时候，新的事件将被压入堆栈顶部，指针指向最后添加的元素。

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When an exit address is encountered, the current active function has returned and the top element on the stack is discarded.

在碰到退出函数时，当前的活动函数就会返回，并释放栈顶元素。

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Stack is empty — error occurs at or below top-level element.

堆栈为空————顶层元素或其下层元素发生了错误。

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