随着肌肉酸痛的增强，肌肉内部的细小纤维正被撕裂。
The tiny fibers that are inside them are being torn apart as muscle soreness develops.
当肌肉进行一项不常接触的活动时，肌肉内部的细小纤维就会被撕裂。
When muscles perform an activity they aren't regularly exposed to, the tiny fibers that are inside them are being torn apart.
当肌肉进行一项其不常接触的活动时，肌肉内部的细小纤维就会被撕裂。
When muscles perform an activity they aren't regularly exposed to, the tiny fibers that are inside them are being torn apart.
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