gravel layer

• 砾石层

gravel layer的用法和样例：

例句

1. Karez water is leaking through the mountain snow water flow inside the gravel layer of diving.
   坎儿井的水源就是山上的雪水经过渗漏流砾石层里的潜水。
2. The conclusion is that the high-pressure gunite technique applied to 30 m thick of sand and gravel layer is feasible.
   通过本次经验为在深厚层砂卵砾石层中进行高喷灌浆施工提供借鉴。