4. addicted adj.成习惯而离不开…
[重点用法]
be addicted to sth／doing sth沉溺于……；专心做……
addict oneself to sth沉溺于……
[典例]
1) 50 million Americans are thought to be addicted to nicotine．据说有五百万美国人有烟瘾。
2) Many kids have now become addicted to surfing the Net．很多孩子现在沉迷于上网
3) He is an addicted traveler．他是个旅行迷。
