人类和灵长类动物的辨色力，可能是用来观察绯红的双颊或脸色苍白用的。

Color vision may have originated in humans and related primates to spot blushes on cheeks and faces pale with fear.

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人类和灵长类动物的辨色力，可能是用来观察绯红的双颊或脸色苍白用的。

Color vision may have originated in humans and related primates to spot blushes on cheeks and faces pale with fear.

youdao