研究结果为一种长期存在的假设提供了最好的证据，即单半球睡眠是在生物寻找敌人的过程中进化而来的。

The results provide the best evidence for a long standing supposition that single hemisphere sleep evolved as creatures scanned for enemies.

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石墨烯是一种只有单原子厚度的碳原子平面层——碳原子按蜂窝状晶格排列。

Graphene is a flat sheet of carbon just one atom thick—with the carbon atoms arranged in a honeycomb lattice.

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这让亚利桑那大学的 Erica Corral 发现碳单原子层是一种理想的陶瓷增强剂。

This led Erica Corral of the University of Arizona to discover that carbon monoatomic layers are ideal for reinforcing ceramics.

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And, if you look carefully, it tries to give the sense of a one electron system.

如果你仔细的观察的话，它试图给人一种单电子系统的感觉。

麻省理工公开课 - 固态化学导论课程节选

It's a single gene defect and we know exactly where the genetic defect is in sickle cell.

是一种单基因缺陷,而且我们准确地知道,镰状红细胞贫血的基因缺陷在哪里

耶鲁公开课 - 生物医学工程探索课程节选

So tone poems are one in movement, and we have got other kinds of genres in music.

交响诗都是单乐章的,所以我们又了解到一种音乐风格

耶鲁公开课 - 聆听音乐课程节选