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　　Organization of this text
　　Civil engineering,the oldest of the engineering specialties,is the planning,design,construction,and management of the built environment．This environment includes all structures built according to scientific principles,from irrigation and drainage systems to rocket-launching facilities.
　　土木工程,最老的工程专业,是建筑环境的规划、设计、施工和管理.这个环境包括从灌溉和排水系统到火箭发射设施的所有根据科学原理建造的结构物.
　　Civil engineers build roads,bridges,tunnels,dams,harbors,power plants,water and sewage systems,hospitals,schools,mass transit,and other public facilities essential to modern society and large population concentrations．
　　土木工程师修建道路、桥梁、隧道、大坝、港口、发电站、水系统和污水系统,医院、学校、公共交通系统,以及现代化社会和大量人口集中的地方所必需的其他公共设施.
　　Civil engineering and civil engineers
　　They also build privately owned facilities such as airports,railroads,pipelines,skyscrapers,and other large structures designed for industrial,commercial,or residential use．
　　他们也修建私人拥有的设施,如机场、铁路、水渠、高楼大厦,和为工业、商业、民用设计的其他大型建筑.