helmet is a protective gear used to protect the head. it is a hat worn in training and war, and an indispensable tool in people's transportation. it is mostly semi-circular, mainly composed of shell, lining and suspension device. the shell is made of special steel, glass fiber reinforced plastic, reinforced plastic, leather, nylon and other materials respectively to resist the head damage caused by bullets, shrapnel and other strikes. in ancient china, it was called "the head", "the head", "the head" or "the head.
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