gun at safety

• 上了保险的枪(炮)

gun at safety的用法和样例：

例句

1. You can not trigger a safety gun.
   你不能扳动上了保险的枪。
2. He snapped the gun closed, cocked it, and released the safety.
   他把枪用力关上，板上了击铁，拉开了保险。