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Although wearing shoes has worn out many problems, many people are not aware of the seriousness of the problem. They are very casual when choosing shoes. "At least 30% of the shoes on the market are not qualified," the experts said. "Experts say that the failure is mainly due to shape and material selection. Many shoes do not conform to human biology. They are too sharp, too high and too low. They also use poor quality materials and have poor ventilation. They are prone to beriberi a