如果对烟雾的浓度积分，浓度就是区域d中，单位体积的烟雾的量，我们就得到了烟雾的总量。
If I integrate the concentration of smoke, which means the amount of smoke per unit volume over d, I will get the total amount of smoke in d, except, well, let's see.
水力管道输送中，无论水平管还是垂直管，混合液的单位压降均同颗粒的体积浓度有关。
During the hydraulic conveying of solids water mixtures in horizontal and vertical pipes, the specific pressure drop of the mixtures is relative to volumetric concentration of solids.
水力管道输送中，无论水平管还是垂直管，混合液的单位压降均同颗粒的体积浓度有关。
During the hydraulic conveying of solids water mixtures in horizontal and vertical pipes, the specific pressure drop of the mixtures is relative to volumetric concentration of solids.
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