1
work as an undercover agent
He worked as an undercover agent for five years.
他当了五年的卧底特工。
卧底特工；秘密特工
先理解核心含义，再看它在真实句子里的用法。
卧底特工；秘密特工
a secret agent hired by a government or business to obtain confidential information about enemies or competitors
He worked as an undercover agent for five years.
他当了五年的卧底特工。
相关中文义项：卧底特工；秘密特工
(military) a secret agent hired by a state to obtain information about its enemies or by a business to obtain industrial secrets from competitors
The police sent an undercover agent to the meeting to gather evidence.
警方派了一名卧底特工去参加那个会议以收集证据。
She worked as an undercover agent for several years before her identity was revealed.
她做了几年卧底特工，之后身份才被公开。
The company hired an undercover agent to find out who was leaking its industrial secrets.
公司雇用了一名卧底特工，以查明是谁泄露了其工业机密。
He worked as an undercover agent for five years.
他当了五年的卧底特工。
She acted as an undercover agent to infiltrate the gang.
她作为卧底特工潜入黑帮。
After training, he became an undercover agent.
训练结束后，他成了一名卧底特工。
Not this
He is undercover agent.
Use this
He is an undercover agent.
英语中可数名词短语如“undercover agent”前需要冠词，而汉语没有冠词，学习者容易遗漏。
Not this
He works like an undercover agent.
Use this
He works as an undercover agent.
“work as”表示实际担任的职务，“work like”表示方式相似；中文“像...一样工作”容易导致混淆。
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常与动词 act as, work as 搭配
Dictionary facts from ECDICT, WORDNET.