【词组解析】
1. content with 满足于
（1）Don't rest content with past achievements.
       不要躺在过去的成绩上睡大觉。
（2）Be not content with the commonplace in character.
       不要满足于普通的共性。

2. contrary to 违反
（1）My sister's taste in dresses is contrary to my own.
       在服装方面,我妹妹的爱好和我完全不同。
（2）Contrary to our expectations, he was eliminated in the first round.
       我们怎么也想不到, 他在第一循环赛里就被淘汰了。

3. cost someone an arm and a leg 代价很大
（1）That new car must have cost him an arm and a leg.
       那辆新车一定让他花费了一大笔钱。
（2）Her pearl necklace cost me an arm and a leg.
       她的珍珠项链花了我一大笔钱。

4. count down 倒数到零或规定的时间
（1）The people at control have already begun to count down.
       控制站的人员已经开始倒计时了。
（2）This program is use to count down from a number to 1.
       此程式是用将某数倒数至一。

5. count one's chickens before they are hatched 过于乐观
--I'm sure to win the prize. I'm going to buy a new car with the money.
   我肯定会获奖的。我要用这笔钱买辆新车。
--Don't count your chickens before they are hatched .
   别指望得太早。

【练习】
英译中：
（1）He is not fatuously content with existing conditions.
（2）The boy was swimming in a direction contrary to the current.
（3）The house cost him an arm and a leg.
（4）Watch it count down To the end of the day.