behind closed doors
US /bɪˈhaɪnd kloʊzd dɔrz/
UK /bɪˈhaɪnd kloʊzd dɔːrz/
成語
秘密地, 私下裡
in private; in secret
範例:
•
The negotiations were held behind closed doors.
談判是秘密進行的。
•
They discussed the sensitive issue behind closed doors.
他們秘密地討論了敏感問題。