英语词汇gravel envelope怎么读，是什么意思，单词翻译、读音、固定搭配用法和短语词组及例句-英汉双解词典

单词	gravel envelope
释义	gravel envelope 简明释义砂砾封皮网络释义 1 ?砂砾封皮砂砾封皮双语例句 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。
随便看	heptadecane heptadecane diacid heptadecanedicarboxylic acid heptadecanenitrile heptadecane heptadecanoate heptadecanoic heptadecanoic acid Heptadecanoic acid Methyl ester heptadecanoic acid heptadecanol heptadecanone heptadecanoyl heptadecatetraene heptadecatriene heptadecatriynoic acid heptadecendioic acid heptadecene heptadecene diacid heptadecenedicarboxylic acid heptadecene dicarboxylic acid heptadecenedioic acid heptadecenoic heptadecenoic acid heptadecoic acid

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