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。
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。
One of the more embarrassing mysteries of human evolution is that people are host to no fewer than three kinds of louse while most species have just one.
人类进化的一个最令人不堪的秘密就是人身上至少长着三种虱子，而大多其他物种只长着一种。
The last event in this history of human-louse cohabitation was the transfer of the gorilla's Phthirus louse to people.
人虱同居的最后历史事件就是大猩猩虱子对人的传染。
So biologists have long been puzzled over the fact that the human head louse is a sister species to the chimpanzee louse, but the pubic louse is closely related to the gorilla louse.
所以生物学家长期为此困惑：为什么人类的头虱是黑猩猩虱子的近亲。而阴虱却是大猩猩虱子的近亲。
The human pubic louse, on the other hand, is related to the gorilla louse, from which it parted company some 13 million years ago.
而体虱与大猩猩虱子有关系，1千3百万年前与大猩猩虱子分道扬镳。
The human pubic louse, on the other hand, is related to the gorilla louse, from which it parted company some 13 million years ago.
而体虱与大猩猩虱子有关系，1千3百万年前与大猩猩虱子分道扬镳。
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