100多年前,法国大文豪雨果就在《悲惨世界》中写道:“下水道是一座城市的良心。”每当夏季来临,暴雨倾盆,“城市的良心”便不得不经常接受考验。如今,欧洲各大城市的市政管理人员发现,越来越多的游客希望潜入下水道一探究竟。这在某种程度上归因于近年来持续火热的环保话题——公众对污水的疏导及处理方式越来越好奇。旅游业正朝地下拓展约瑟夫·戈特沙尔的大 More than 100 years ago, French ambassador Hugo wrote in Les Miserables: “The sewer is the conscience of a city.” Whenever the summer comes, torrential rains, “the conscience of the city,” have to be regularly accepted test. Today, municipal administrations in major European cities find that more and more tourists want to dive into the sewers. This is partly due to the persistent hot topic of environmental protection in recent years - the public is increasingly curious about how to divert and treat sewage. Tourism is expanding underground Joseph Joseph Gottschal’s big