A head covering of hard material,such as leather,metal,or plastic,worn by football players,firefighters,construction workers,motorcyclists,and others to protect the head.

• 头盔，由坚硬材料如皮革、金属或塑料制成的头部覆盖物，由橄榄球队员、消防队员、建筑工人、摩托车骑手或其他人配戴，用以保护头部。