acid rain:- نتيجة لتلوث الجو بأكاسيد النيتروجين والكبريت (المعجم الموحد لمصطلحات الهندسة المدنية)
acid rain:- rain containing acids that form in the atmosphere when industrial gas emissions (especially sulfur dioxide and nitrogen oxides) combine with water (Princeton WordNet 3.1)
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