2. In slave society, human beings obtain the resources they want through self-made special tools, such as; Cut down trees with an axe, plow land, etc. .......
3. In feudal society, human beings obtained resources by hiring slaves, such as; The Spanish forced Indians to work in silver mines and other places. ....
4. In today's society, human beings obtain resources through high technology and some cutting-edge equipment, such as; Offshore oil production and coal mining, etc. .....
Hope to adopt ~ ~ ~