'my uncle once urged me to choose mechanical engineering or auto engineering as my major,' Yu said. 'I chose biotechnology out of my interest in biology class in high school.

于敏说，我舅舅当初曾劝我学机械工程或自动化方面的专业，但我根据自己对高中生物课的兴趣选择了生物技术专业。

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Many factors led me to major in mechanical engineering. The most important factor is I like tinkering with machines.

许多因素导致我选择了机械工程这个专业，但最重要的一个因素就是我非常喜欢摆弄机械。

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By the time I entered college, I had become more interested in the physics and aerodynamics of flight, which has led me to pursue a degree in mechanical engineering.

当我进入大学的时候，我对物理学和飞行的空气动力越来越有兴趣，致使我最终攻读了机械工程学位。

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