皮若勒博士说：从美国田径研究结果能推得的一个教训就是，做任何突然的改变，可能都不是什么好主意。

If there's one lesson from the USA Track and Field study, said Dr. Pereles, it is that "sudden changes are probably not a good idea."

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大家好，我是美国的博士生，想练习我的中文，希望我们能一起进步。

Hey everybody, I'm an American PhD student who would like to practice my Chinese a bit.

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