这个世界的幸运儿所进行的过度消费成了一个环境问题，其严重程度也许只有人口增长问题能与之相提并论。

Overconsumption by the world's fortunate is an environmental problem unmatched in severity by anything but perhaps population growth.

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也许只有在电影中才会发生这样悲伤的故事。

A tragic story that perhaps happens only in the movies.

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或者也许只有两枚？

Or maybe only two?

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You wonder why would it be that the whole western half of the U.S. gets only or the western third of the U.S.

你也许会质疑，为什么,美国整个的西部一半只有一个,或者说美国西部的三分之一。

耶鲁公开课 - 金融市场课程节选

Of a million cells in the bone marrow there might only be one of these.

一百万个骨髓细胞中,也许只有一个多能干细胞

耶鲁公开课 - 生物医学工程探索课程节选

One or two cases, maybe just one actually, where I've got more than one article by the given author, I've given the title of the article as well.

一种或两种情况，也许实际只有一种，我不止找到该作者一篇文章，我也会给出文章的标题。

耶鲁公开课 - 死亡课程节选