Discussions were to take place in total secrecy. 讨论在绝对保密的状态下进行。

shrouded/cloaked/veiled in secrecy The Iraqi contract was shrouded in secrecy for months. 伊拉克合约被秘密遮掩了几个月。

swear sb to secrecy (=make someone promise not to tell anyone) We were all sworn to secrecy. 使某人发誓保密