秘密
secret; covert; clandestine; confidential;private;januis clausis[拉](behind closed doors);in camera;in chamber;in private
～會(huì)議secret meeting; closed-door session;private session/～活動(dòng)clandestine activities/～交易shady dealing/～警察secret police;secret policeman/～條約secret treaty/～投票secret ballot/～外交secret diplomacy/～文件secret papers;confidential document/～組織underground(or secret)organization