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1·Officers had tailed the gang during a major undercover operation.

警方在一次重大的秘密行动中跟踪过这个团伙。《柯林斯英汉双解大词典》

2·Journalists informed police who planted an undercover detective to trap Smith.

记者们向警方提供了信息，警方安插了一名卧底侦探诱捕史密斯。《柯林斯英汉双解大词典》

3·Swanson persuaded Hubley to work undercover to capture the killer.

斯旺森说服了赫布利秘密工作以捕获凶手。《柯林斯英汉双解大词典》

4·The illegal payments were discovered by a journalist working undercover.

这些非法付款是一位暗中查访的新闻记者发现的。《牛津词典》

5·So I decided to go undercover to collect it, he said.

所以，我就决定当卧底来收集证据了。

6·He is already back in America, undercover, working another case.

他早已回到美国，秘密地开始另一桩案子。

7·Plain clothes policeman who work undercover to detect crime.

隐蔽调查犯罪的便衣警察。

8·Joe Pistone had thought he was going to go undercover for six month.

乔皮斯通本以为自己只要做六个月的卧底。

9·Turns out that, to go undercover, Pistone knew how to make all the right moves.

事实证明，作为一个卧底，皮斯通清楚该如何正确行动。

10·In the past ten days two undercover journalists have been arrested in Damascus.

在过去十天里，有两名地下记者在大马士革被捕。

卧底

1·Three years ago, a little painting caused big trouble for undercover agent Bob Wittman.

三年前，一幅小小画作给卧底特工鲍勃·惠特曼带来了大麻烦。

2·After the battle of Salinas, Steinbeck decided to go undercover for months, to research what would become the Grapes of Wrath.

萨利纳斯战斗发生后，斯坦贝克决定去卧底几个月，为《愤怒的葡萄》寻找素材。

3·Meanwhile, in Singapore undercover officers seized several tiger skins that had been advertised for sale online.

同时，新加坡的卧底人员截获了数具用于给在线销售作广告的虎皮。

4·In every undercover operation, there is a tipping point, a moment when the bad guys move from suspicion to trust.

在每次卧底行动中，都有临界点，一个坏人由怀疑到信任的时刻。

5·So I decided to go undercover to collect it, he said.

所以，我就决定当卧底来收集证据了。

秘密的

1·Officers had tailed the gang during a major undercover operation.

警方在一次重大的秘密行动中跟踪过这个团伙。《柯林斯英汉双解大词典》

2·He is already back in America, undercover, working another case.

他早已回到美国，秘密地开始另一桩案子。

3·Last year two members of the executive committee were suspended for soliciting bribes from undercover reporters.

去年两个执行委员会的成员就因向秘密记者索贿被停职。

4·Airport screeners still fail undercover tests of their ability to spot concealed weapons.

机场扫描系统的秘密测试结果表明，它还不能查出隐秘武器装备。

5·The operation followed months of undercover police work that gathered evidence of an extraordinarily lucrative empire.

经过数月的秘密工作，收集了这个非常有利可图的团伙的证据之后，警察展开了这次行动。

(1)undercover agent卧底；警方密探