重点讲解：
1. be addicted to 入迷的；着迷的；
They ar
e addicted to computer games.
他们对计算机游戏上了瘾。
2. keep on 重复；继续；
He didn't come at all. It was silly of us to
keep on waiting for him.
他根本没有来，我们傻等了他半天。
3. set down 放下；
The waiter
set down refills on a coffee table.
侍者把重新斟满的酒杯放在咖啡几上。
4. be mad at 对……生气；
She
was mad at her husband for forgetting her birthday.
她因为她的丈夫忘了她的生日而生气。
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