These policemen wear helmets to protect themselves.
这些警察戴着头盔保护自己。
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。
Everyone had to wear helmets outside.
在外面每个人都戴着太空头盔。
These policemen wear helmets to protect them.
这些警察戴着头盔保护自己。
Motorcyclists must wear helmets to shield them injury.
摩脱车手辟须带头盔保护卦蓟免受伤害。
You must wear helmets when entering the construction site.
进入工地现场，必须佩带安全帽。
Motorcyclists must wear helmets to shield them from injury.
摩托车手必须戴头盔保护自己免受伤害。
Operators shall wear safety helmets.
操作人员应戴好安全帽。
It is much safer for the children to wear safety helmets when biking.
在骑自行车时戴上安全帽对于孩子会更安全。
Do we have to wear the helmets?
一定要戴上头盔吗？
Do we have to wear the helmets?
一定要戴上头盔吗？
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