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。
单词：gravel pack 相关文章
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说一口流利的英语，从简单的单词开始。 听听，读读，背背，今天你的词汇量又增加了5个。 单词/词义 中英例句 单词听读 kowtow [ 5kau5tEu ] Be polite, but don
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现在就要启程：Eliza Doolittle - Pack Up Artist：Eliza Doolittle Song：Pack Up I get tired And upset And im trying to care a little less When i google i only get depressed I wast taught to dodge those issues I was told Dont worry Theres no do
流行英文歌曲
Pack Up I get tired And upset And im trying to care a little less When i google i only get depressed I wast taught to dodge those issues I was told Dont worry Theres no doubt Theres always something to cry about When youre stuck in an angry crowd The
好听的英文歌曲
Republican presidential candidate John McCain lent a hand Wednesday, as delegates to the Republican convention took time out to pack supplies for hurricane victims in the Gulf Coast. The looming storm led convention organizers to curtail opening day
VOA标准英语2008年（九月）
When I was a kid, I remember my dad used to sing an old, WWI song, Pack up your Troubles, while he was getting dressed for work in the morning. The lyrics from the chorus of the song play in my head often when Im packing for a tripPack up your troubl
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