秘密 [mì mì]
secret; clandestine; confidential:
unravel the secrets of the universe;
揭开宇宙的秘密
The senate had a session today with closed doors.
参议院今天召开一次秘密会议。
Do it, by all means, but strictly on the quiet.
这件事一定要干， 不过要严守秘密。
短语:
秘密报告 secret report;
秘密串连 make secret contacts with sb.;
秘密电报 {讯} bamboo telegraph; bamboo wireless;
秘密斗争 underground struggle;
秘密会议 secret meeting; closed-door session;
秘密活动 clandestine activties;
秘密计划 clandestine plan;
秘密交易 clandestine dealing;
秘密接头 {讯} wiretap;
秘密结社 form a secret society;
秘密警察 secret police;
秘密贸易 clandestine trade;
秘密内阁 interior cabinet;
秘密渠道 back channel;
秘密条约 secret treaty;
秘密通信 confidential correspondence;
秘密投票 secret ballot; Australian ballot;
秘密外交 secret diplomacy;
秘密卫星 unannounced satellite;
秘密文件 secret papers; confidential document;
秘密文件指示符 backdoor file indicator;
秘密武器 {军} [德] wuwa; secret weapon;
秘密消息 classified information;
秘密协议 knockout agreement;
秘密选举 secret election;
秘密准备 undisclosed reserve;
秘密资产 nonledger assets
参考：有道词典