white-tie
短语a. （晚会或社交场合）系白领结、穿燕尾服的
释义与例句
adj.
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1.
Of an event: very formal; usually requiring a tailcoat for men.
习语
a. （晚会或社交场合）系白领结、穿燕尾服的
Of an event: very formal; usually requiring a tailcoat for men.