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crash helmet

noun
🔊/ˈkræʃ helmɪt/
🔊/ˈkræʃ helmɪt/
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  1. a hat made of very strong material and worn to protect the head when riding a motorcycle or driving a racing car（骑摩托车的）防护头盔，安全帽
    Topics Clothes and Fashionc1, Transport by car or lorryc1