正如查尔斯达尔文在19世纪指出的那样，怀有敌意地露出牙齿可能是人们表现愤怒情绪的通用表情。

Baring the teeth in a hostile way, as noted by Charles Darwin in the nineteenth century, may be a universal sign of anger.

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许多欧洲人可能把美国看作是一个傲慢的、对外国人充满敌意的超级大国。

Many Europeans may view the U.S. as an arrogant superpower that has become hostile to foreigners.

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白人就更加是满怀敌意了。

Whites were downright hostile.

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Science is very hostile to innovation when it challenges existing theory, sort of like management, the same thing.

科学对创新是有敌意的,当创新在挑战已存在的理论，跟管理一样，同样的道理。

麻省理工公开课 - 固态化学导论课程节选