helmet /ˈhelmit/ n. ［c］头盔: have on/wear a helmit带着头盔；put on(remove/take off) a helmet戴上（取下）头盔 Both have their helmets on. 两人都戴着头盔。The shop at the corner of the street sells helmets.街道拐角那家商店出售安全帽。