求翻译：酸雨出现的频率和强度不断增加，而且市境的酸雨大多为煤烟型酸雨。煤烟型酸雨不仅严重危害人体健康，酸化土壤、腐蚀原料、建材及房屋，而且还对资源、环境构成威胁，直接制约着社会经济活动和人民生活。对广大农村的危害也不容忽视，一般而言，被酸雨危害后大田作物将减产15％～20是什么意思？

The acid rain frequency and intensity increasing, and Urban Habitat, acid rain, mostly coal-burning acid rain. Acid rain caused by coal combustion not only serious harm to human health, acidification of soils, corrosion of materials, building materials and housing, but also pose a threat to resource

Acid rain is the increasing frequency and intensity, and the city of acid rain is mostly soot-acid rain. Soot-acid rain not only serious threat to human health, soil acidification, corrosion resistant materials, building materials and housing, but also to resources, the environment poses a threat to

The acid rain appears the frequency and the intensity increase unceasingly, moreover city boundary acid rain mostly for coal smoke acid rain.Not only coal smoke acid rain severely impair human body health, acidified soil, corrosion raw material, building materials and house, moreover also to the res

Acid rain occurrence of increasing frequency and intensity, and city borders are mostly coal-burning of acid rain acid rain. Coal-acid rain not only endanger human health, soil acidification, corrosive materials, building materials and housing, but also poses a threat to resources, environment, dire

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