在砾石充填作业期间放置的为支承和挡住砂子所用的由金属制成的过滤装置。
A metal filter assembly used to support and retain the sand placed during gravel pack operations.
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。
In drainage of agricultural lands, a filter or gravel envelope is used to prevent the entrance of fine sand and silt into the drains.
砾石过滤器是当今各国最常使用的过滤器型式之一。
The gravel filter is the most commonly used filter in all countries nowadays.
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