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。

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When each of the other elements are parsed, you pop the Employee object off the stack, call the relevant set function, and push the object back on to the stack.

每当其他元素被解析时，您将这个Employee对象弹出Stack，调用相关的set函数，然后将该对象推回Stack。

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