在很长一段时间里，我们认为所有有牙齿的鲸鱼，包括抹香鲸和虎鲸，彼此都是密切相关的。

For a long time, we assumed that all whales that had teeth including sperm whales and killer whales were closely related to one another.

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最新研究让一种生活于恐龙时代以前的有牙齿的水生动物再现于我们的眼前，据科学家说，这种生物的吞食方式就像电影《异形》里的生物一样。

New research is shedding light on toothy Marine animals that lived before dinosaurs and, according to scientists, ate like the creature did in the movie "Alien."

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牙齿有一层叫做釉质的坚硬表层。

Teeth have a hard surface layer called enamel.

《牛津词典》

There shall be weeping and gnashing of teeth.

那里会有嚎啕的声音以及等着咀嚼食物的牙齿。

耶鲁公开课 - 弥尔顿课程节选

Ads in newspapers, like this one in Charleston, would read, "Negroes wanted. I am paying the highest cash prices for young and likely Negroes, those having good front teeth and being otherwise sound."

报纸上的广告,比如查尔斯顿市的这一则,是这么写的,"诚购黑奴,本人愿付最高价格,购买年轻可靠之黑奴,需有整洁的牙齿以及悦耳的声音"

耶鲁公开课 - 美国内战与重建课程节选