if you've got a hill or valley and there's a cart on wheels it's going to go down to the bottom.

如果我们有一座山或者山谷，并且,有一个有轮子的车，这辆车会自动滑到底部。

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So you got like a surfboard-shaped board and put wheels on it, so they could ride it.

找一块冲浪板形状的板子，加上轮子，就可以滑了。

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If you were the only guy with wheels on your suitcase, people would think you look a little odd.

如果你是唯一一个箱子上带轮子的人，人们可能会觉得你有点古怪。

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The idea of putting wheels on suitcases goes back only to 1972 and it was Bernard Sadow who invented-- this is amazing, right--the wheeled suitcase and he got a patent on it.

在行李箱上加轮子的想法,可以追溯到1972年2,是伯纳德？沙度发明的-,这很神奇，对吧,并且他凭此获得了专利。

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Now, the amazing thing is, if you go to Mexico you can go to museums that have children's toys from pre-Columbian Mexico with wheels.

现在神奇的事情是，如果你去墨西哥,你可以去博物馆,那里有前哥伦比亚墨西哥时代的,带着轮子的幼儿玩具。

耶鲁公开课 - 金融市场课程节选

It used to be, before 1972, that suitcases never had wheels.

972年以前，行李箱，是没有轮子的。

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