头虱症的英文：
head lice

head是什么意思：
n. 头，头部；头痛；理解力；首脑，首长
v. 作为…的首领；站在…的前头；给…加标题；出发；前进；驶往；用头顶
adj. 头的；在前头的；在顶端的；主要的；首要的

Heads will roll

a head of a gang; a ringleader; a chieftain; the head of a group; a cock
头目

They hit their heads together when heading the ball.
争顶头球时，二人的头撞在了一起。

My head is not that clear.
我的头脑不怎么清醒。

Tom headed the ball into the goal.
汤姆把球顶进了自己的球门。

lice是什么意思：
louse的复数

The germs that cause typhus and bubonic plague are carried by fleas and lice. These insects put the germs in a person's body when they bite.
引起斑疹伤寒和腺鼠疫的病菌是由跳蚤和虱子传染的。它们咬人时把病菌带给人体。

Her shapely fingernails reddened by the blood of squashed lice from the children's shirts
由于替孩子们掐衬衫上的虱子，她那秀丽的指甲被血染红了。

The boy should go to his mother and ask her to search his hair for lice
让小王子去找他母亲，让妈妈给他抓头发里的虱子。

Pointing at the dead lice with her other hand, the little girl counted them haphazardly,One, two, five, eight, ten...
女孩子把另一手指着死虱，口里乱数：“一，二，五，八，十...”。