近年来，北京在改善生态环境、绿化城市方面做了大量工作。市政府提出“四季常绿，三季有花”、“满城翠绿，处处鲜花”的要求，经广大群众和园林工作者的共同努力正在逐步实现。尤其是重要节日的北京城，已成为“绿色的海洋，鲜花的世界”。但由于多种园林植物和花卉从外... In recent years, Beijing has done a great deal of work in improving the ecological environment and greening the city. The municipal government put forward the requirements of “Four Seasons Evergreen, Three Seasons Flowers”, “Full City Green, Everywhere Flowers”. With the joint efforts of the broad masses and landscape workers, the government is gradually realizing this goal. In particular, the important festival of Beijing City, has become a “green ocean, flowers world.” However, due to a variety of garden plants and flowers from the outside ...