材料与人类文明(国外英文资料).docVIP

材料与人类文明(国外英文资料) After learning the material and human civilization course, I can not help feeling: Materials Science every little step, human civilization is a big step forward, is the use of different levels of material that marks the great development of human productivity. In the early stage of human development, the natural resources directly obtained are often used to meet the simplest living needs because of the extremely backward productivity. Therefore, the proportion of refined labor is very small. But with the evolution of human being and the deepening of social division of labor, humans interest in processing primitive materials in nature has gradually increased. Since then, with the need to survive after years of accumulation and the reality of life, human beings began to consciously use stones (except bones, stone is one of the earliest human use of materials) as the material for making tools. At first, the material was rough in shape, but it was later processed that enabled mankind to master the power of multiple physical forces, and human beings were forced to develop the ability to win in the struggle against the environment. Human beings first made simple and basic tools with stones and bones to supplement the functions of the palms, fingers, nails and teeth. These tools are held by hand. When they acquired the ability to use not only the primitive stone but also the processing, it was almost equivalent to the completion of a revolution. When people used fire about 500 thousand years ago, the value of stone was even greater. Human beings are created by labor, and labor begins with the tools of manufacture. In the already discovered Paleolithic human sites, we can see that our ancestors used stone grinding stone knives, made of stone axes, scrapers, these are the early humans used tools. The emergence of labor tools also brought about the progress of social material and human civilization. The biological study shows that during this period, people i