1.  public security
2.  ensure public security

• 1. 保安: Security | Security Guards | Security Officer | Guard
• 2. 保安局: Security Bureau | Security Wing
• 3. 保安员: Security Guard | security staff | Security Officer | Security Manager

更多释义

• 1.袭击事件已被保安摄像机拍摄下来。
  The attack was captured on film by security cameras.
  dict.yoduao.com
• 2.他们装扮成保安人员混了进去。
  They got in disguised as security guards.
  dict.yoduao.com
• 3.保安部队的到达使局势更加难以控制。
  The situation was further inflamed by the arrival of the security forces.
  dict.yoduao.com

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