Well, it apparently is not so obvious because in the Americas, before Columbus came-- " pre-Columbian America-- there were no wheeled vehicles anywhere.

好吧，从表面上看这似乎不那么显而易见,因为在美洲大陆，在哥伦布到来之前-,在“前哥伦比亚美洲-,根本没有任何轮式交通工具存在。

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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