设想一下：你二十岁，而且是世界一流大学的一名很有发展前途的研究生。
Imagine this: you are twenty-one years old and a promising graduate student at one of the top universities in the world.
设想一下：你二十岁，而且是世界一流大学的一名很有发展前途的研究生。
Imagine this: you are twenty-one years old and a promising graduate student at one of the top universities in the world.
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