B2 a strong, hard hat that covers and protects the head头盔,安全帽
More examples
It's very risky to ride your bike without wearing a cycle helmet.
To keep the helmet in position, fasten the strap beneath the chin.
Is the strap on this helmet adjustable?
He pulled on his helmet and straddled the motorbike.
You cannot come onto the building site unless you're wearing a helmet.
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