曾几何时,蓝天、新鲜的空气对城里人来说是再平常不过的了。然而,在人类文明发展到21世纪的当天,蓝天、新鲜的空气都变得这样珍贵,甚至有些令人可望而不可及。1998年世界卫生组织在定期公布的世界大气污染最严重的10个城市中,中国就占了7个,环保,一时间成为人们街头巷尾的话题,目前我 Once upon a time, the blue skies and the fresh air were more commonplace with city dwellers. However, on the day human civilization developed into the 21st century, the blue sky and the fresh air have become so precious and even elusive. In 1998, among the 10 cities with the most serious air pollution in the world announced on a regular basis by the World Health Organization, China took up 7 environmental protection issues and became the topic for many people in the streets for a time. At present, I