鞋垫用常换吗?

春秋冬三季，穿鞋几乎都离不开鞋垫。鞋垫不常洗、常换，易脏，细菌趁虚而入，会得脚病，这个浅显道理，似乎人人都懂。 可是，习惯使然，或出于节俭，或惰性，或因为太忙，有些人（中老年人居多）十天半月懒

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