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自净作用
archit. auto purification
desert. autopurification
tech. effect of self-purification; self-purification
wind. natural purification; self purification
自净作用河水污浊，长流自清
ecol. self purification
自净化作用
met. self-purification
自 净 作用
: 41 phrases in 9 subjects
Agriculture2
Earth sciences2
Ecology3
Environment2
Nursing1
Oil / petroleum2
Space4
Technology14
Water resources11

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