behind closed doors
US /bɪˈhaɪnd kloʊzd dɔrz/
UK /bɪˈhaɪnd kloʊzd dɔːrz/
成语
秘密地, 私下里
in private; in secret
示例:
•
The negotiations were held behind closed doors.
谈判是秘密进行的。
•
They discussed the sensitive issue behind closed doors.
他们秘密地讨论了敏感问题。