一种寄生在水虱的腿上，另一种寄生在身体上。
One sort live on the creature's legs, the other on its body.
而且，刚才那个水中怪影的头部太大了，不像是一群水虱游在一起能形成的效果。
What's more, the head of that water monster was way too big to be only a large cluster of these insects swimming together.
就像寄生在人身上的三种体虱一样——它们是以抓住不同毛发的能力来分的——两种蛭形生物同样寄生在水虱身上。
Just as three sorts of body lice, specialised to be able to grasp different sorts of hair, live on humans, so water lice are host to two sorts of bdelloid.
就像寄生在人身上的三种体虱一样——它们是以抓住不同毛发的能力来分的——两种蛭形生物同样寄生在水虱身上。
Just as three sorts of body lice, specialised to be able to grasp different sorts of hair, live on humans, so water lice are host to two sorts of bdelloid.
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