This article's main task is to design the fire control system, burglar alarm systems and perimeter defense systems and subsystems to achieve the three systems.

本设计的主要工作是设计和安装火灾监控系统、防盗报警系统和周边防护系统，并实现三个子系统的系统集成。

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At the start of each experiment the group cuts a fire break along the perimeter of the area.

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Planes dropping water and retardant, along with six helicopters, were trying to create a perimeter and contain the fire.

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Prior to the plane's departure, U.S. Marine Humvees patrolled the airport perimeter, where the sniper fire had erupted Thursday.

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