undercover

中文意思

• adj. 秘密的；卧底的

英文释义

• adj. conducted with or marked by hidden aims or methods

例句

1. adj. 秘密的；卧底的

   The undercover officer spent several months gathering evidence against the criminal organization.

   这名卧底警官花了几个月的时间收集针对该犯罪组织的证据。