Many aqueducts from ancient Roman times still stand today near the Mediterranean Sea.许多古罗马时代的引水渠至今还保留在地中海附近.Hilly countries can be canalized by the construction of locks, tunnels, and bridge aqueducts.可以通过修筑闸门 、 隧道及高架引水道...
Many aqueducts from ancient Roman times still stand today near the Mediterranean Sea.许多古罗马时代的引水渠至今还保留在地中海附近....a nationwide system of aqueducts to carry water to the arid parts of this country.将水输送到该国干旱地区的全国性导水系统Central ...