Why are people shorter when they get older?
本文作者： TEENS
人老了为什么会变矮？ People can become 2.5 to 7.6 cm shorter when they get old. This is mostly because their spines (脊柱) become shorter. Also, their muscles (肌肉) become weak (不强壮的) and they can have a crooked back (驼背). |  |
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