"cloak-and-dagger activities behind enemy lines"
同义词: clandestine hole-and-corner(a) hugger-mugger hush-hush secret surreptitious undercover underground
以上来源于: WordNet
ADJ A cloak-and-dagger activity is one which involves mystery and secrecy. 秘密的; 神秘的 [usu ADJ n]
She was released from prison in a cloak and dagger operation yesterday.
她昨天在一个秘密的行动中被释出狱。
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