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荷兰的堤防和防波堤卫星地图 (世界奇迹指南)

http://en.wikipedia.org/wiki/Delta_Works In the North Sea Flood of 1953 a break in the dikes and seawalls in the Netherlands killed 1,835 people and forced the evacuation of 70,000 more. Ten thousand animals drowned, and 4,500 buildings were destroyed. To prevent such a tragedy from happening again, an ambitious flood defense system was conceived and deployed, called the Delta Works (Dutch: Deltawerken).