Freedom from danger, injury, or damage; security.

无危险；无危害；安全。

Device for preventing damage to machinery or injury to workers.

(防止机器受损或工人受伤的)安全装置。

Device which, when set, prevents the accidental firing of a gun.

(枪)保险器。

In football, a play in which the player with the ball is tackled and downs the ball in his own end zone.

【美】【体】橄榄球比赛中带球者被抱住绊倒而使球在己队球门线后触地。

Base hit.

【体】(棒球)安打(打者安全上垒且无人被刺杀出局者)。