| 单词 | undercover operation |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔operation〕Undercover operations led to the arrest of the gang.警方的卧底行动使这一团伙的成员悉数落网。麦克米伦高阶〔operation〕Ten arrests were made in an undercover operation.在一次秘密行动中有十人被捕。韦氏高阶〔undercover〕It was an undercover operation designed to catch drug smugglers.这是一次旨在抓捕毒品走私犯的秘密行动。外研社新世纪 |
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