perimetern.周长；周界；边缘perimeter patrol officer外围巡逻员Perimeter Defense System环形防御系统perimeter edge trim kits圆边修整工具perimeter defence system外围防护系统perimeter acquisition radar环视搜索雷达perimeter intrusion detecting周界入侵探测perimeter for retinal detachment视网膜剥离用视野计Perimeter Acquisition Radar Building环形搜索雷达室perimeter of a perimeter-marked area标界区周界Perimeter Acquisition Radar Simulation环形搜索雷达模拟