The service's lead scientist for the eastern cougar, Mark McCollough, said the animal has likely been extinct since the 1930s.

管理局东部美洲狮方面的首席科学家马克·麦克洛说，这种动物有可能从20世纪30年代起就已经灭绝了。

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For instance, Temple Grandin, an animal scientist with Asperger's, invented a humane, efficient way to slaughter cattle.

比如动物学家坦普尔。戈兰丁，她同样也罹患亚斯·伯格症，然而她却发明了一种更为人性和高效的屠宰牛的方法。

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The scientist would try showing the cans to the animal one hour later, or two.

一两个小时以后，科学家试着向动物展示这些桶。

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