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河流自净
agric. self-purification of stream
oil stream's self-purification
tech. river self-purification (作用); self-purification of river (作用); self-purification of stream (作用); stream self-purification (作用)
河流自净作用
eng.geol. stream self-purification
河流自净: 14 phrases in 4 subjects
Agriculture1
Ecology1
Technology7
Water resources5