waste gases p____ the air and do great harm to our health请填词

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waste gases p____ the air and do great harm to our health请填词
waste gases p____ the air and do great harm to our health请填词

waste gases p____ the air and do great harm to our health请填词
答案是:
waste gases p(olutte) the air and do great harm to our health
pollute:污染
pollute the air:污染空气