Building Dams(16.修筑大坝)

Controlofhislife-sustainingwatersupplyhasalwaysbeenoneofman’sprimaryconcerns.For5,000years,damshavebeeninstrumentalinthiscontrol,beingusedtoavertfloods,divertrivers,storewater,andirrigateland.Manyoftoday’sconstructionsfulfillthesesameage-oldfunctions;damsarestillusedforagriculturalirrigationanddo ......(共5920字)[阅读本文]>>

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