Why is it that some groups of people still hunt animals, wear little or no clothing, have little or no technology, while others are very sophisticated in their technology, industry, transportation, communication, food gathering and storage?
Why is it that some groups of people still hunt animals, wear little or no clothing, have little or no technology, while others are very sophisticated in their technology, industry, transportation, communication, food gathering and storage?
为什么有些民族仍旧猎杀动物，几乎不穿衣服，几乎没有科技，而其他的民族拥有高端的科技，发达的工业，顺畅的交通，迅达的通讯，及便捷的物流？