博物馆的保安每天都会巡逻检查展品。

The museum ___guard patrols daily to check the exhibits.

拳击手必须时刻保持防守姿势以免被击中。

The boxer must always keep his ___guard up to avoid getting hit.

他戴上头盔来保护头部免受撞击。

He wears a helmet to ___guard his head against impacts.

这个机器的防护罩可以防止手指被夹伤。

The machine's ___guard prevents fingers from getting caught.

即使在派对上，她也保持警惕。

Even at the party, she kept her ___guard up.