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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.
2019年12月四级真题（第一套）听力 Section C
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As muscle soreness develops, the body has to work to repair the muscle tears, but this doesn't happen immediately.
2019年12月四级真题（第一套）听力 Section C
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Repair of damaged cells takes about two days, and afterwards the soreness disappears.
2019年12月四级真题（第一套）听力 Section C
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Soreness occurs since your leg muscles aren't used to that movement.
2019年12月四级真题（第一套）听力 Section C
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That's why there is most often a delay associated with muscle soreness.
2019年12月四级真题（第一套）听力 Section C
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Unfortunately, there is little that can be down to relieve muscle soreness.
2019年12月四级真题（第一套）听力 Section C