helmet

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柯林斯詞典

helmet /?h?lm?t/ (helmets)

1. N-COUNT A helmet is a hat made of a strong material which you wear to protect your head. 頭盔

劍橋詞典

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.