secret sign
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网络例句
以下结果来自互联网
- They sign a secret deal with their main rival.

他们与其主要竞争者签了一份秘密协议。 - A secret sign or signal given in answer to another.

应答的口令为回答中一个口令而给出的秘密记号或口令 - A secret sign or signal to be given to a sentry in order to obtain passage; a password.

暗号为通过岗哨而必须给出的秘密记号或口令;暗语 - a secret formula; secret ingredients; secret talks.

秘密公式;秘密成分;秘密谈话。 - Keep a secret in

保守秘密
