博物馆的守卫确保艺术品的安全。

The museum ___guard ensures the safety of the artworks.

在拳击比赛中，他始终保持防守姿势以免受伤。

In the boxing match, he always kept his ___guard up to avoid injuries.

电动工具必须安装防护罩以防意外。

Power tools must have a ___guard installed to prevent accidents.

保安人员整晚都在守卫银行的安全。

The security personnel will ___guard the bank all night.

过马路时要当心来往车辆。

You should ___guard against traffic when crossing the road.