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	embryonic pole embryonic primordum embryonic procambium embryonic rest embryonic root embryonic r wave embryonic sac embryonic sarcoma embryonic science embryonic segregation embryonic selection embryonic shield embryonic soil embryonic spot embryonic stage embryonic stem embryonic stem cell embryonic stem cell embryonic stem cell research embryonic stem cells embryonic structure embryonic structures embryonic system embryonic testis embryonic tissue

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