For humans in primitive times, slowness in distinguishing whether the person in front of them is a member of their own tribe or a member of an enemy tribe was a life-or-death issue.

在原始社会，倘若有人难于分辨面前的人是属于自己的部族，还是敌方部落的一员，那就是生死攸关的问题。

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For humans in primitive times, slowness in distinguishing whether the person in front of them is a member of their own tribe or a member of an enemy tribe was a life-or-death issue.

在原始社会，倘若有人难于分辨面前的人是属于自己的部族，还是敌方部落的一员，那就是生死攸关的问题。

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