precipitate retention
... yellow precipitate 黄降汞 ; 氧化汞 precipitate retention 沉淀留着 hydroxide precipitate 氢氧化物沉淀 ...
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《水缸》老院里安上了自来水，但这里的人们仍旧保留着用大水缸蓄水的习惯，既可沉淀水质，又能不让水龙头遗洒而浪费。
Water tank tap water comes into this old yard, but people here keep the habit of saving water with bit tank in order to settle the impurity of water and save the water in case of tap-losing.
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