a padded helmet worn by people riding bicycles or motorcycles; protects the head in case of accidents
双语例句
1
Requiring helmets to meet a recognized safety standards is important to ensure that helmets can effectively reduce the impact of a collision to the head in the event of a crash.
要求头盔符合公认的安全标准，这对于发生撞车事故时，确保能够有效降低对头部撞击带来的影响十分重要。
2
This time, the two teenagers, riding a mini-motorbike without wearing crashhelmets, were killed in a collision with a police car.