我们都知道古代世界七大奇观,但是很可能没有听说过现代世界七大奇观的事。最近,在美国土木工程协会的主持下,经过全世界各国工程协会的详细调查,评出了下述伟大工程为当代世界七大奇观。 一、伊泰普大坝 (Itaipu Dam) 足有8公里宽的伊泰普大坝耸立在巴西和巴拉圭的边界上,横跨巴拉那河。为修筑此坝,工人们将世界上最大的七条河流改道,搬运走5000万吨土石,以开凿一条2.1公 We all know the seven wonders of the ancient world, but we may not have heard of the seven wonders of the modern world. Recently, under the auspices of the American Society of Civil Engineering, a detailed survey of engineering associations from all over the world has identified the following great projects as the seven wonders of the world. I. Itaipu Dam The Itaipu Dam, 8 kilometers wide, stands on the border between Brazil and Paraguay, across the Paraná river. To build this dam, workers diverted the seven largest rivers in the world and transported 50 million tons of earth and stone to cut a 2.1-kilometer