winnow
v
(a) [Tn] blow a current of air through (grain) in order to remove (the chaff) 風選(谷物)(以除去皮殼).
(b) [Tn.pr, Tn.p]
~ sth away/out; ~ sth from sth remove (the chaff) from grain in this way (用風選法)除去(皮殼)
winnow the husks from the corn 用風選法除去谷物的殼
(fig 比喻) winnow the truth from the mass of conflicting evidence 從大量相互矛盾的證據中去偽存真.