precipitation的解释n.坠落,沉淀,凝结;冰雹precipitation的例句Therewillbeprecipitationonnorthernhillstonight.今夜北部山区有降雪。Thetr eatmentofmetalortheseparationofmetalfromoresandoreconcentr atesbyliquidprocesses,suchasleaching,extr action,andprecipitation.水冶金术通过液体过程,象过滤,提炼,沉淀等方法处理金属,从矿石中或矿石浓缩物中分离出金属