But human doesn't have that kind body part?
所有跟贴·加跟贴·新语丝读书论坛http://www.xys.org/cgi-bin/mainpage.pl
送交者: Nixrreg 于 2006-5-25, 21:58:07:
回答: 螺旋桨比paddle wheel快(英国人在1840年作了个两种船的拔河比赛) 由 HunHunSheng 于 2006-5-25, 21:40:27:
所有跟贴:
加跟贴
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