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重点讲解：
1. out of work 失业；下岗；
Many young people are out of work.
很多年轻人失业。
2. clean up 清理，清除(污染物)；
Under pressure from the public, many regional governments cleaned up their beaches.
迫于公众压力，许多地区政府对各自海滩进行了清理。
3. instead of 代替…；而不是…；
The islanders use a system of barter instead of money.
岛上的居民实行的是以物易物，而不是用货币。
4. pick out 挑出；选出；拣出；
I vote that you try to pick out the trail for us.
我提议由你来选我们该走哪条小路。
n. 污染，污染物
