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我们总是使自己的身体背负重荷。结果我们后背疼痛,脚趾酸痛,臀部骨折和膝盖瘸跛的频率增加。倘使科学家可以重新设计人类身体,重新建造我们的器官,四肢和感觉系统来使我们变得更坚强,更不易垮掉,结果会怎么样呢?