The sand box model is a reduced scale representation of the natural porous medium domain . 砂槽模型是将天然的多孔介质区域按比例缩小的模型。
2.
The miniature working style pictured above is about 30 cm high and accurately reproduces the original one in a proportional ratio 上图中的缩小的模型大约有30厘米高，是原型按比例缩小的模型。
