gravels造句
Suetion devices are inadequate in
gravels or very porous soils.
吸水装置对砂砾或非常疏松的土壤是不适用的.
They may form concentrated pockets in
gravels.
它们可能在砾石堆积物中形成富集的矿囊.
Graves are a mix of
gravels, clay and sand carried out by the river.
它混合着碎石 、 粘土和河流带来的沙子.