我们周围的环境,可以分为三类——生活、生产和社会环境,其中包含生物、化学、物理和社会心理的因素。有的生物会给人类健康和生命带来威胁。致病性生物可能传播烈性传染病,比如狂犬病毒、艾滋病毒等;另外,空气中存在导致过敏的花粉、粉尘等,对人类的健康也可造成危害。近年来,化学因素对人体的影响越来越受到重视, The environment around us can be divided into three categories - life, production and social environment, which contain biological, chemical, physical and social psychology factors. Some creatures pose a threat to human health and life. Pathogenic organisms may transmit potent infectious diseases such as rabies virus and HIV. In addition, pollen, dust and other substances that cause allergies in the air may also cause harm to human health. In recent years, the influence of chemical factors on the human body has drawn more and more attention.