winnow
/ˈwɪnəu; `wɪno/ v
(a) [Tn] blow a current of air through (grain) in order to remove (the chaff) 风选（谷物）（以除去皮壳）.
(b) [Tn.pr, Tn.p]
~ sth away/out; ~ sth from sth remove (the chaff) from grain in this way （用风选法）除去（皮壳）
winnow the husks from the corn 用风选法除去谷物的壳
(fig 比喻) winnow the truth from the mass of conflicting evidence 从大量相互矛盾的证据中去伪存真.