_________(污染）air does harm to our health,it's necessary to keep a_英语解答

_________(污染）air does harm to our health,it's necessary to keep air fresh and clean

人气：187 ℃　时间：2019-10-10 06:06:36

解答

contaminated,被污染的.
规范的科技文献中polluted一词很少用,通常用作名词,如air pollution control,water pollution management 等.
仅供参考.
祝好