头盔在英语中被称为helmet。它的来源源于拉丁文的"caput"，意为头部。例句：

He was wearing a helmet to protect his head in case of a fall. （他戴着头盔，以防头部摔伤。）

She put on her helmet and started the motorcycle. （她戴上头盔，启动摩托车。）