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filtrationn.

英 fɪl'treɪʃn | 美 fɪl'treʃən
中文n. 过滤;筛选
词根词源
filtration (n.)"act or process of filtering," c. 1600, perhaps from French filtration (1570s), noun of action from filter "to filter" (see filter (v.)).
关键词
filtration