sand/gravel rock

• 砂砾岩

sand/gravel rock的用法和样例：

例句

1. The results also show that the model reasonably represents the coupling between the seepage and the 3-D stresses in calcirudite rock.
   根据理论分析和试验结果建立了砂砾岩在三维应力作用下的耦合特性关系模型。