名词
中文翻译：头盔
同义词：
['cap', 'helmet', 'headgear', 'safety helmet']
例句：
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1. He put on his helmet andwent out for a bike ride.
他戴上头盔出去骑自行车。
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2. The driver wore a safetyhelmet when he was driving.
司机开车时戴着安全头盔。
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3. The boy was wearing ahelmet while riding his bicycle.
那个男孩骑自行车时戴着头盔。