study group - usa
研究小组-美国
以上为机器翻译结果，长、整句建议使用 人工翻译 。
One anomalous finding of the USA Track and Field study was that runners who were used to stretching and were assigned to the nonstretching group became injured at a disproportionately high rate.
美国田联的研究还发现了一个怪现象: 被分到跑前不拉伸的小组里的, 而之前有跑前拉伸习惯的, 非常容易受伤, 比例很高.
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