English translation for "gravel envelope"

砾石包层
砂砾保护层
砂砾封皮

Related Translations:

gravels:  卵石

gravel shoulder:  砾石路肩

gravel shovel:  砾石铲

gravel wall:  砾石围填层

loamy gravel:  带壤土砾石带土砾石带粘土砾石

pebble gravel:  小砾石

pack gravel:  充填砾石

bound gravel:  胶结砂砾透镜体

gravel separator:  卵石分离器

drift gravel:  冰砾沙矿层

Example Sentences:

1.

In drainage of agricultural lands, a filter or gravel envelope is used to prevent the entrance of fine sand and silt into the drains . 在农田排水中常常采用砾石或过滤层来防止粉细砂和泥沙进入排水沟。

Similar Words：

"gravel dredger" English translation, "gravel drive" English translation, "gravel dune" English translation, "gravel dust filter" English translation, "gravel dyke" English translation, "gravel envelope well" English translation, "gravel equivalent factor" English translation, "gravel face" English translation, "gravel fall rate" English translation, "gravel fallout" English translation