helmet [ˈhelmɪt]

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n.钢盔；头盔；安全帽；vt.给…戴头盔

a strong hard hat that covers and protects the head

The man on the motorcycle wore a helmet. 骑摩托车的人戴了一顶头盔。
Wear your safety helmet when you go down. 戴上安全帽再下去。