| 词汇 | bike helmet | 
| 释义 | bike helmet  noun [ C ] mainly US uk/ˈbaɪk ˌhel.mət/ us/ˈbaɪk ˌhel.mət/ (UK usually cycle helmet, cycling helmet)  自行车头盔 a hard hat that you wear to protect your head if you have an accident while you are riding a bicycle | 
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