These floods have been very useful because they irrigate the Nile Delta and deposit a rich layer of topsoil used for growing crops.
这些洪水一直非常有用，因为它们灌溉着尼罗河三角洲，沉积下厚厚的一层表土，可以用来种庄稼。
Three-dimensional turbulent boundary layer on the ground board is measured through the ground effect tests of a delta wing with aspect ratio 3.
本文通过一个展弦比为3的三角形机翼的地面效应试验，测量了地板上的三元紊流附面层。
Main hydrocarbon bearing layer systems are Middle-Upper Jurassic shallow Marine sandstone, Upper Crataceous river faciess and delta faciess clastic rock.
主要的含油气层系为中上侏罗统浅海相砂岩和上白垩统河流、三角洲相碎屑岩。
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