事实上，银河系中24%的元素质量是由氦组成的，这使它成为宇宙中第二丰富的元素。

In fact, 24 per cent of our galaxy elemental mass consists of helium, which makes it the second most abundant element in our universe.

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一段关系是由两个独一无二的个体组成的。

A relationship is made of two unique individuals.

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当我们检查研究支出时，我们发现，在我国每年花费的350多亿美元中，几乎三分之二是由联邦政府支出的。

When we examine expenditures for research, we find that of the more than $35 billion spent each year in this country, almost two-thirds is spent by the federal government.

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We talked about mitosis last time; it's described more completely in the chapter, where two cells are formed from one.

我们上节课说到过有丝分裂,在那一章里更详细的阐释了,细胞是怎么由一生二的

耶鲁公开课 - 生物医学工程探索课程节选

The Pashtun people are one-thirds of Afganastan and two-thirds of Parkistan.

普什图人是由三分之一阿富汗人和三分之二的巴基斯坦组成的。

普林斯顿公开课 - 国际座谈会课程节选

Disaccharides, where you have several sugars paired together, are maltose, sucrose, and lactose; and then you can see to the right of the sugars themselves which things are paired in this case.

二糖,即两种单糖结合而成的,包括麦芽糖,蔗糖,以及乳糖,你们可以看到这些二糖本身是由右边的,单糖两两相结合而得到

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选