Must wear helmets 必须戴好安全帽
Players must wear helmets 选手必须戴头盔
wear space helmets 戴太空头盔
wear r helmets 戴头盔
wear bicycle helmets 戴头盔
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》
These policemen wear helmets to protect themselves.
这些警察戴着头盔保护自己。
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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。
However, the government says it does strongly advise riders to wear helmets.
BBC: Quad bike helmet call by doctors
Jenson Button and Mark Webber will wear helmets with his initials.
FORBES: First Formula 1 Indian Grand Prix Underway
London Mayor Boris Johnson said there were no plans to require cyclists to wear helmets or to provide them for the capital's fleet of hire bikes.
BBC: Bradley Wiggins backs cyclist helmet laws after bus death
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