单词：gravel pack
gravel pack的用法和样例：
例句
- 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。
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The general store was the next-biggest building, also boasting a sheltering awning, and two long wooden benches under its cluttered windows for passersby to rest upon. There was a flagpole in front of the Masonic hall; from its top a tattered Union J
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英语美文
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