Muscles will only contract forcefully a certain number of times before they refuse to pull hard again.

肌肉在强力收缩一定次数之后将无法再继续用力的拉缩。

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Muscles will only contract forcefully a certain number of times before they refuse to pull hard again.

肌肉在强力收缩一定次数之后将无法再继续用力的拉缩。

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