由气圈、水圈、岩石圈及生物圈所构成的自然环境,是人类赖以生存和发展的背景和必要条件。环境质量的好坏,对人们及子孙后代的健康影响极大。环境科学就是一门综合研究环境质量与人类的生存和发展相互关系的特殊规律(受社会因素制约的自然规律)及其保护、控制、利用和改造的新兴科学。它是二十 The natural environment formed by the balloon, hydrosphere, lithosphere and biosphere is the background and necessary conditions for human survival and development. The quality of the environment has a great impact on the health of people and future generations. Environmental science is a new science that comprehensively studies the special laws (the natural laws restricted by social factors) and the protection, control, utilization and transformation of environmental quality and the existence and development of human beings. It is twenty