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。

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When muscles perform an activity they aren't regularly exposed to, the tiny fibers that are inside them are being torn apart.

当肌肉进行一项不常接触的活动时，肌肉内部的细小纤维就会被撕裂。

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Yesterday morning, chongqing iron and steel held IPO net start off to perform an activity.

昨日上午，重庆钢铁举行了IPO网上路演活动。

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The cult leader is in police custody awaiting proceedings on charges that he set up an organization "whose activity is associated with violence on citizens and instigation to refuse to perform their civil duties, " according to the state-funded Itar-Tass news agency.

CNN: Cult awaits end of days in cave after leader's arrest