密室

huì yì shì zài mì shì li jìn xíng de

会议是在密室里进行的。

The meeting was held behind closed doors.

zhè xiē chuán dān shì zài ā mǔ sī tè dān de yī jiān mì shì zhōng yìn zhì chéng de

这些传单是在阿姆斯特丹的一间密室中印制成的。

The leaflets had been produced in a backroom in Amsterdam.