许多从西欧旅游归来的人,无不对当地优雅的环境和当地人环保意识赞叹不已。不少人都不理解,西欧各国不同的民族,不同的习俗,为什么对保持环境卫生都会从自身做起,自觉行动呢?欧洲历史上曾发生过瘟疫原来,欧洲历史上曾发生过最为 Many people who have returned from tourism in Western Europe have been amazed by the local elegant environment and local environmental awareness. Many people do not understand why Western nations have different nationalities and different customs. Why do they always start doing their own thing and consciously act to maintain sanitation? There has been a plague in European history. It has happened in European history.