.. So, why didn't somebody think of-- you're sitting there with your child playing with a wheeled toy and then you're going out to carry some heavy stuff and you're dragging it along the ground.

因此，为什么有人想不到-,当你和玩着玩具车的小孩,坐在一起,然后你出去,拿一些很沉的东西,你却是生拉硬拽地把它放在地上拖过来。

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But finally, Reiner says, well, thank you for visiting us, it's all very wonderful, but you know our audience would really like to know; it seems like a simple question but it's awfully hard to understand, but how can a great, big, enormous, heavy thing like this airplane get off the ground?

但最后 雷纳说到,谢谢你的来访,太棒了,但你知道吗,我们的观众非常想知道,这问题貌似简单,但却很难让人明白,问题是,像这么一个巨大且沉重的飞机,是如何飞起来的呢

耶鲁公开课 - 古希腊历史简介课程节选