The horizontal cross section of the pyramid is square at any level, with each side measuring 229 m (751 ft) in length. The maximum error between side lengths is astonishingly less than 0.1%.

金字塔的水平剖面在任何高度都是正方形，每面的长度也都是229米(751英尺)，惊人地是，其最大的误差小于0.1%。

youdao

But now notice, I can substitute now for this v squared, I can substitute the square of this that is the orbital speed and then I get M G over R.

现在注意我能,代替这个v平方，我能代入这个平方,那是轨道速度,然后得到MG在R上。

youdao

m And so you lose your m, and so you see that y center of mass then becomes the square root of three divided by eight times l.

你失去了，得到了y轴质量中心,成了平方根,3除以8再乘l开方。

youdao

And the fourth thing to notice is, I've used abstraction. I've said nothing about how I'm going to make square root.

第四件事情就是，我运用了抽象,我对怎么去求平方根没有提及。

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I'm selling tickets to a comedy show at the Times Square Art Center,

我在时代广场的艺术中心卖喜剧表演的门票，

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Well, I'm going to get back, let's just draw a bigger square than usual that's roughly four times the size.

嗯，返回的是，我画一个更大的方形,大致上是4倍的大小。

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