Contagious: a human head louse clings to a strand of hair.
感染力：附着在一根头发上的人类头虱。
The head louse, Pediculus humanus capitis is a tiny insect which lives on the hair. Occasionally, it is also seen in the eyebrows or beard.
头虱是一种寄生于头发上的细小昆虫，有时亦会在眼眉或胡须间出现。
The human head louse, for instance, evolved from the chimpanzee louse when the ancestors of humans and chimps split apart some five million years ago.
例如，人头虱是500万年前当人类祖先与黑猩猩分化时从黑猩猩身上的虱子进化来的。
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