undercover work
美
英 
例句
Perry: Lois. How's the undercover work coming?
露易斯。臥底做得怎么樣?
On the other hand, Richard Walsh lacked Jack Bauer's outlaw tattoos - a few gained in undercover work; most part of Jack's personal roadmap.
另一方面,理查德·沃爾什身上沒有杰克·鮑爾那些亡命之徒的紋身——其中一些是做臥底時紋上去的,但大部分都是杰克個人生活的記錄。
Since 1997 an average of 20 investigations each year had involved undercover work.
自九七年起平均每年有二十宗查案需要臥底人員協助。