closed
英 [kl??zd]
美[klozd]
- adj. 關著的；不公開的
- v. 關；結束；接近（close的過去分詞）
詞組搭配
behind closed doors
taking place secretly or without public knowledge
秘密地；暗中地
closed book
a subject or person about which one knows nothing
完全理解不了的科目；完全理解不了的人
accounting has always been &B{a closed book to} me.
會計學對我來說一直是一門完全理解不了的科目。