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请问严冬冬登山下山时必须戴护膝用双杖吗?不用真的会伤膝盖吗?如果用怎样使用才合理?谢谢
2011-09-05 11:01:082011-09-05 10:46:54 - 回复2011-09-02 17:00:15
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