English 
Usually, the shell of the helmet is made of high-strength materials, such as metal, engineering plastics, Kevlar fiber, etc., through its deformation to absorb most of the impact; the lining material has the ability to absorb sweat, keep warm, and absorb shock. Military helmets often have the functi
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Paddling down a rushing river offers an unmatched adrenaline rush. The thrill of navigating rapids draws countless outdoor enthusiasts to the water every year. Beneath the foaming surface, however, lies a very real danger of submerged rocks, heavy currents, and unpredictable obstacles. Protecting yo
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Paddling down a rushing river is an exhilarating experience. The thrill of navigating white-water rapids draws thousands of outdoor enthusiasts to rivers and streams every single year. But beneath the foaming water and beautiful scenery lies a very real danger of submerged rocks, heavy currents, and
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