Those variables pop off the stack when their containing function is complete.

当其所包含的函数完成后，这些变量将从堆栈中弹出。

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The list of directories ACTS like a stack — you push a directory onto the top of the stack, and pop a directory off the top again to get it back.

该目录列表的行为就像一个堆栈——您将一个目录压入堆栈顶部，并从顶部弹出一个目录以取回它。

youdao

In the pop method, after the top pointer is decremented, elements still maintains a reference to the object being popped off the stack.

在pop方法中，在顶部指针递减之后，elements仍然会保留对将弹出堆栈的对象的引用。

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