a type of hard hat that protects the head, worn, for example, by a police officer, a soldier or a person riding a bike or motorbike or playing some sports头盔；防护帽- Police in riot helmets lined the streets.戴着防暴头盔的警察站在沿街两边。
- A protective helmet should be worn at all times.随时都应该头戴防护帽。
- Cycle helmets dramatically reduce the risk and severity of head injuries.自行车头盔极大地降低了头部受伤的风险和严重程度。
see also blue helmet, crash helmet, pith helmetTopics Clothes and Fashionb2, Transport by car or lorryb2, Sports: ball and racket sportsb2Oxford Collocations Dictionaryadjectiveverb + helmethelmet + nounSee full entry Word Originlate Middle English: from Old French, diminutive of helme, of Germanic origin.
