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1·If you undertrain, you may not finish, but if you overtrain, you may not start.

如果训练不足，你也许不能完成比赛。但如果训练过度，你可能无法开始比赛。

2·They trained three to four times per week out of concern they would overtrain or become stale.

他们通常每周训练三到四次，而且不在意他们是否会训练过度或者变得疲惫。