permanent lag固定延迟
permanentadj.永久的;持久的n.<口> 烫发
permanent radiation damage永久辐射损伤
permanent magnet flowmeter永磁流量计
permanent bending of rotor大轴弯曲
permanent magnet centering磁块调节中心位置
permanently neutral nation永久中立国
permanent sprinkler system固定式喷灌系统
permanent disqualification永久不合格
permanent vegetation cover永久植被
permanent-service office日夜营业的电信局