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VOA慢速英语:韩国向中国提出雨水项目合作应对污染
2019-03-10来源:和谐英语
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artificial – adj. not natural, but made by people
concentration – n. a large amount of something in one place
smog – n. air pollution
complicated – adj. hard or difficult
advance – adj. far on in time or course
precipitation – n. rain or snow that falls to the ground