边界粘土层被科学家用来确定一个灭绝物种衰落的速度。

Boundary clay layers are used by scientists to determine the rate at which an extinct species declined.

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濒临灭绝物种的名单中列有将近600种鱼。

The list of endangered species includes nearly 600 fishes.

《牛津词典》

作为已灭绝物种或人类种族，尼安德特人与旧石器时代中期的工具有关。

An extinct species or race of human beings, Homo neanderthalensis, associated with Middle Paleolithic tools.

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Several large animal species had disappeared so people had to find other animals and so this changed from going to find animals to domesticating animals, and shift from collection of plants to production of plants.

很多大型动物物种已经灭绝了,人类不得不去寻找其他动物,因此这也就完成了从狩猎到驯养的转变,从采集到种植的飞跃

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选