秘密警察

例句：

1. 1. The secret police are investigating the case.
   秘密警察正在调查这个案件。
2. 2. The secret police have been accused of corruption.
   秘密警察被指控腐败。
3. 3. The secret police are trying to uncover the truth.
   秘密警察正试图揭露真相。