要成功拿到博士学位，你必须真正的扩展人类的知识边界。

To escape with a Ph.D., you must meaningfully extend the boundary of human knowledge.

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因此，经验是有限的书，但知识是没有边界。

So experience is limited, but knowledge in book is without boundary.

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了解你的地理知识：哪五个非洲国家的边界与地中海相邻？

Know your geography: Which five African countries border the Mediterranean Sea?

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了解你的地理知识：哪五个非洲国家的边界与地中海相邻？

Know your geography: Which five African countries border the Mediterranean Sea?

youdao