我们平时走路都是一前一后摆臂,而不会同手同脚,当看到某人一顺走的时候,会当成笑话。那么,你有没有想过,人为什么不同手同脚一顺走呢?人们行走时的摆臂方式一直是未解之谜。因为摆臂看起来是一个“成本高昂”的习惯,它不仅需要肩部运动,而且浪费力气。甚至有比较极端的理论认为,摆臂是人类从四肢爬行进化后留下的“后遗症”。 We usually walk one after the other arm swing, but not with his hands and feet, when you see someone walking along, will be a joke. So, have you ever wondered why people go hand in hand with different hands? The way people swing their arms while walking is an unsolved mystery. Because the swing arm appears to be a “costly” habit, it requires not only shoulder movement but also exertion. Even the most extreme theory holds that the swing arm is the “sequelae” left by humans as they crawl and evolve from the limbs.