正文

VOA慢速英语:Earth's Ozone Layer Shows Signs of Recovery

2014-09-16来源:VOA

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deplete – v. to use up most or all of something

man-made - adj. made by people, not by nature

fragile – adj. easily broken or damaged

substitute; pl. substitutes – n. a person or thing that takes the place of someone or something else

tackle – v. to deal with (something difficult)