mono-wheel cart should be invented before 4wheel cart. it should

来源: fixanycars 于 2009-07-03 15:13:54 [] [博客] [旧帖] [给我悄悄话] 阅读数 : (173 bytes)

mono-wheel cart should be invented before 4wheel cart. it should exist 2500 years ago. you can see the bronze 4wheel cart that was found in the Chinese First Empire's tomb.

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