世界上三分之二的淡水都存于冰川之中。

Two-thirds of the world’s fresh water is stored in glaciers.

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如果我们在好莱坞待上三天，我至少要看到一个明星。

If we are spending three days in Hollywood, I want to see at least one star.

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自贡恐龙博物馆：世界上三个最大的恐龙博物馆之一，建立在恐龙化石遗址上。

Zigong dinosaur museum: it is one of the three biggest dinosaur museums in the world built on the site of a group of dinosaur fossils.

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so you can see that there is going to be two sets in antibonding, three sets in bonding for a net of one, giving us the single bond.

因此你能看到,反键轨道上有两组，三组成键，得到一组净成键，所以成的是单键。

麻省理工公开课 - 固态化学导论课程节选

They're derived from a precursor called triacylglyceride, which is as glycerol molecule with three fatty acid chains dangling off of it.

它们来源于一种叫三酰甘油的前体,由甘油分子上连接了,三个脂肪酸链构成

耶鲁公开课 - 生物医学工程探索课程节选

I've been here in MIT for thirty years, and in the early nineties I taught the large freshmen physics course, and electromagnetism.

我麻省理工工作三十年了，在上世纪九十年代初,我就开始给大一新生上物理课，以及电磁学。

麻省理工公开课 - 媒体、教育、市场课程节选