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Bike Helmets Protect Your Head
自行车头盔保护你的头部
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Helmets have a hard outer shell and soft foam inside.头盔外部坚硬，内部柔软多孔。
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The foam crushes slightly during a fall.跌倒时，内层泡沫会轻微压缩。
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This slows your head down gently and safely.从而温和而安全地减缓头部运动。
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It spreads impact force over a larger area.它将冲击力分散到更大面积上。
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Always wear a helmet that fits snugly.务必佩戴贴合头部的头盔。
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Straps must be tight but comfortable.系带须紧固但舒适。
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Materials science makes helmets both light and strong.材料科学让头盔既轻便又坚固。
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Safety gear is smart engineering for real life.防护装备是面向现实生活的精巧工程。