您要查找的是不是：
- gravel pervious layer 砂砾石透水层
- Gravelly-sand over an iron-pan and gravel layer. 沙砾覆于铁质土层与砂砾层之上。
- I'm afraid he's not pervious to our proposal. 恐怕他不会接受我们的建议。
- Young people are readily pervious to new ideas. 青年人乐意接受新思想。
- My father scratched gravel for Shanghai last night. 我父亲昨晚匆匆忙忙去了上海。
- Application of soil cement paddling process in treatment of Xijiao reservoir pervious layer 水泥土搅拌法在西郊水库渗水层处理中的应用
- The road is covered with gravel. 这路用砾石铺成。
- We bumped up and down along the gravel path. 我们沿砾石小路颠簸而行。
- This layer of rock contains a lot of flint. 这一岩层中有大量燧石。
- The gravel ingredient of concrete. 石碴组成混凝土的砂料
- Layered gravel and charcoal to make a filter. 将砂砾和木炭分层以做成过滤器
- if the pervious layer is especially thin with fine grains, the geomembrane should be taken for seepage control so that the cost for seepage control could be reduced. 若透水层特别薄且透水层的颗粒较细时可采用土工膜进行堤基防渗，以节约堤基防渗的成本。
- The workers mixed the asphalt with sand and gravel together. 工人们把沥青和沙子、石块混合在一起。
- The inner layer of the wall of a spore. 孢子内壁孢子壁的内层
- The car bumped on the uneven surface of the gravel road. 汽车在高低不平的砾石路面上颠簸着。
- There is a fine layer of dust on the desk. 桌子上有一层薄薄的尘土。
- A layer of coarse gravel is often placed around the drain tile. 常常在排水瓦管周围铺一层粗石砾。
- The middle, usually fleshy layer of a fruit wall. 中果皮果皮中间通常含肉较多的那一层
- The bottom layer is a mixture of sand and clay. 最下面的一层是沙和泥的混合物。
- A fine layer of dust covers everything. 所有的东西都盖了一层薄薄的灰尘。
