safety nut锁紧螺母
safetyn.安全;保险
safety crutch安全拐杖
safety stiich安全缝
safety running安全运行
Safety Tactics安全策略
safety-firstadj.安全第一
safety winding安全绕组
safety archive安全档案
safety plunger保险活销
safety marking安全标记
safety problem安全问题