helmet

/ˈhɛlmət/

armor plate that protects the head

中文释义：头盔；安全帽

Cyclists must wear a helmet to protect their heads in case of an accident.

骑自行车的人必须戴头盔，以防发生事故时保护头部。

The construction worker put on his helmet before entering the site.

建筑工人进入工地前戴上了安全帽。