摘要： li yan, an engineer, was born on february 9, 1965 in beijing, china. after he graduated from qinghua university in 1987, he made an important decision in his life. he decided to go to the united stat

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　　li yan, an engineer, was born on february 9, 1965 in beijing, china. after he graduated from qinghua university in 1987, he made an important decision in his life. he dec

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