1·It is compulsory for all motorcyclists to wear helmets.
所有骑摩托车的人都必须戴头盔，这是强制性的。
—— 《牛津词典》
2·We all wore bicycle helmets.
我们都戴着自行车头盔。
3·The cyclists should be fined for not wearing helmets.
骑自行车的人不戴头盔应该被罚款。
4·People refuse to wear helmets because they're thick and heavy.
人们拒绝戴头盔，因为它们又厚又重。
5·The cyclists should use the cycle lanes and wear helmets and fluorescent jacket at night.
骑自行车的人应该使用自行车道，晚上戴头盔和穿上发荧光的夹克。