...是主要原因，而是因为 arm exercises are an ideal way to become physically 手臂运动是一种保持健康（become physically fit）的 fit.
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become physically fit
身体健康
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Many viewers who follow the show faithfully have observed contestants become more physically fit in the process.
许多忠实的观众发现参赛者们在这个比赛过程中身体变的越来越匀称。
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Lorraine is physically fit, and George has become a self-confident and successful science fiction author.
洛莲变得十分苗条，而乔治则更加自信，并且成为了一名成功的科幻小说作家。
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