safety nut锁紧螺母
safetyn.安全;保险
safetybuoyance储备浮力,安全浮力
safety cashbox现金保险柜
safety barrier[航空]停机拦截网
safety stopper安全止动件
safety ecology安全生态学
Safety warning安全警示
safety defence安全防御
safety emotion安全情绪
safety element安全元件,事故棒
safety release脱开安全器