警察从事秘密的调查活动才叫卧底，完全不同于治安小信息员。
Undercover agents are police who work undercover to investigate crime and are totally different from little security informants.
警察从事秘密的调查活动才叫卧底，完全不同于治安小信息员。
Undercover agents are police who work undercover to investigate crime and are totally different from little security informants.
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