undercover

undercover
adjective
  1. (of a person or their activities) involved in or involving secret work within a community or organization, especially for the purposes of police investigation or espionage
    (尤指警方调查或间谍)秘密工作的
    an undercover police operation.
    秘密警察行动。
  2. provided with shelter
    有覆盖物的;有外套的
    undercover seating.
    有外套座。
adverb
  1. as an undercover agent
    任密探(或特工)
    he worked undercover in Northern Ireland.
    他在北爱尔兰从事密探工作。
英语宝典
考试词汇表