其中一个刚学会走路的孩子在放声大哭，另一个则流着鼻涕。

One of the toddlers was bawling, and the other had a runny nose.

《柯林斯英汉双解大词典》

共生关系是两个或多个物种之间的相互作用，其中一个物种生活在另一个物种体内，或依靠这一物种生活。

A symbiotic relationship is an interaction between two or more species in which one species lives in or on another species.

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关键是人们变得不再习惯以一种负责任和独立的方式去思考和行动。其中就存在另一个大问题。

The point is that people grew unaccustomed to thinking and acting in a responsible and independent way. Herein lies another big problem.

《柯林斯英汉双解大词典》

I said what hold the bonds together, what holds two atoms together is the attractive force we have between each electron and the other nucleus.

我说过什么将它们结合在一起，将两个原子结合在一起的是一个吸引力,其中一个原子中的电子与另一个原子中的原子核之间。

麻省理工公开课 - 化学原理课程节选

If there's a tie, half the voters at that position go for one of the candidates and half of them go for the other.

如果是平均,一半的选票划给其中一个候选人,另一半给另一个候选人

耶鲁公开课 - 博弈论课程节选

First, I'd like to explore two dimensions of education and I'm thinking not only in terms of classroom education which you are familiar with but also the distance education which is so prominent in the development today.

首先，我想探究两个维度的教育,其中一个角度是,你们熟悉的课堂教育,另一个角度是远程教育,现在它的发展十分显著。

麻省理工公开课 - 媒体、教育、市场课程节选