秘而不宣

duì zhěng jiàn shì mì ér bù xuān

对整件事秘而不宣。

The whole affair is still shrouded in secrecy.

duì chè lí de xì jié mì ér bù xuān

对撤离的细节秘而不宣。

The details of the evacuation are veiled in secrecy.

tā hěn yǒu xīn jì duì zhè tiáo xīn xiāo xi mì ér bù xuān

她很有心计，对这条新消息秘而不宣。

She was cunning enough to keep this latest piece of information secret.