- 问题详情:Infall2006,theNationalBasketballAssociation(NBA)startedusingbasketballsmadewithsynthetic,orman-made,materialinsteadofleather(皮革).Theymadethechangebe-causetheywantedeverybasketballtheyusetofeelandbounce(*起)thesame.Notallleatherballsareexactlyalikeinwe...
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