如果你是一个摩托车司机，开车时要带安全帽保证自己的安全。
If you are a motorbike driver, you should wear a helmet to protect yourself.
因此，摩托车骑士戴安全帽是非常必要的。
Therefore, it is extremely important for the motorcyclist to wear the helmet.
瞧！一辆摩托车上载五个人，而且没有一个人戴安全帽。
Look! There are five people on that scooter, and none of them are wearing helmets!
瞧！一辆摩托车上载五个人，而且没有一个人戴安全帽。
Look! There are five people on that scooter, and none of them are wearing helmets!
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