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材料是人类进行生产斗争的最根本的物质基础。在历史上,材料的变革促进了人类历史的发展,因而它曾被作为人类历史跨越时代的标志。人类从蒙昧状态进步到今天的高度文明
Material is the most fundamental material basis for the struggle of mankind in production. Historically, changes in materials have contributed to the development of human history, so it has been used as a symbol of human history spanning the ages. Mankind has progressed from ignorance to a highly civilized state today