但是由于重工业比重较大和长期以来忽视环境保护，辽河流域已被认为是中国受环境污染最严重的流域之一。
Because of high ratio of heavy industry and neglect of protecting the water environment, Liao river Basin has become one of the most polluted rivers in China.
钢铁工业是产生环境污染最严重的行业之一。
Iron and steel industry is one of the most serious industries producing environmental pollution.
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