As a result of fluvial scouring and aggrading the riverbed, the alluvial layer is fluid-saturated porous medium.
由于河流冲刷和河床加积，沉积层多饱和多孔。
I fill the shark shape with a medium gray, duplicate the drawing layer and move it to the top of the stack.
我把鲨鱼整个填充为中灰度，复制开始的手绘图层把它移到层的最上方。
The paper constructed a time depth conversion model of plane wave propagation in two layer medium.
本文构造了一种在二层介质中平面波传播的时—深转换模型。
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