在一次艰苦的锻炼或一整天体力活动后，肌肉酸痛是很常见的。
After a tough workout or a day full of physical activity, it's common to find your muscles aching.
在一次艰难的手术中，医生将基特的神经移动到她上臂肌肉的不同部位。
In a difficult operation, a doctor moved Kitts's nerves to different areas of her upper-arm muscles.
训练过程中，心跳超过每分钟200次；乳酸在肌肉里聚集到酸痛的程度；肺里脆弱的毛细血管都会破裂。
As they train, hearts race at over 200 beats a minute; lactic acid builds to stinging levels in muscles; fragile capillaries burst in the lungs.
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