人们在自然界里经常地接触着各种自然现象,全部人类的历史中,贯彻着人和自然的斗争,这正是人类社会的存在和发展的过程。然而人们怎样去满足需要,以及怎样才能改善生活的条件就必须要在科学和技术上不断的提高。我们需要了解自然科学,研究它们,掌握它们的规律,用来和自然作斗争。科学中的主要部门之一——化学——它是说明物质是怎样构成的, People are often exposed to various natural phenomena in the natural world. In the history of all human beings, the struggle between man and nature is carried out. This is the process of the existence and development of human society. However, how people can meet their needs and how they can improve their living conditions must be continuously improved in science and technology. We need to understand the natural sciences, study them, grasp their laws, and fight against nature. One of the main departments in science, chemistry, is to explain how matter is formed.