在人类历史的发展中,某一特定材料的使用是历史时代划分的标志。在史前时期人们使用的最简单的工具都是用石头制作的,这个历史时期就叫做石器时代。青铜的使用又把人类带进了具有更先进生产力的青铜时代。只有当人类发现并使用了强度更高,在自然界最广泛存在的铁的铁器时代以后,人类的文明才得到高度发展。由此可见,在科学发展史、工业发 In the development of human history, the use of a particular material is a hallmark of the division of history. The simplest tools people used in prehistoric times were made of stone, a period known as the Stone Age. The use of bronze in turn brought humans to the Bronze Age with more advanced productivity. Only when mankind discovered and used a more intense iron age have human civilization been highly developed after the iron age of iron in nature. This shows that in the history of scientific development, industrial development