n.头盔；安全帽
The sword bit the knight's helmet. 剑刺穿了武士的头盔。
A miner's lamp is fixed onto his helmet. 矿灯固定在矿工的头盔上。
The safety helmet is held on by an elastic strap. 安全帽用一根松紧带系住。
All visitors to the site must wear safety helmet. 到工地的所有参观者必须带上安全帽。
