perimetern.周长;周界;边缘
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