Note the caching is not really required for the particular traversal algorithm you are using, but I leave it in to show how to do this if it is needed as you expand this tool in the future.
注意，这个缓存对于您使用的特定遍历算法并不真正需要，我在这里使用它只是为了展示当您将来需要扩展这个工具时应该怎样做。
The minutes for an April 30 management meeting talk about recruiting from Facebook and note: “People don’t leave jobs they leave managers, ” they “leave situations that are making them sad.”
4月30号的高管会议记录显示，他们讨论过如何从Facebook挖人，中间有提到一个观点：“员工离职绝不是离开某些工作岗位，他们离开的是某些管理者，”他们“离开的是让他们伤心的那个环境”。
This, combined with a handwritten thank-you note, will make the best possible impression and leave the door open for future follow-up-which you should do, of course!
这种办法再加一张手写的感谢便条，可能会给别人留下很深印象，未来的后续工作大门也随之开启。当然，这是你应该做的。
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