According to a German professor, the soreness comes from straining your muscles in an uncommon way, for example, jumping on a bicycle for a ride, because you haven't ridden in a long time.
据一个德国教授说,疼痛来自以不平常的方式拉伸你的肌肉,例如,骑上自行车兜风会疼痛,因为你已经很长时间没骑车了。
So, every time I ride on the subway, it's kind of exciting for me.
所以,每次我坐地铁的时候,都很兴奋。
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