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	washbox discharge sill washbox feed sill washbox piston valve washbox screening plate washbox screenplate washbox slide valve Washbrook wash bucket wash bulkhead Washburn washburn cell washburn core Washburn County Washburne Washburn L. Washburn washburn riser Washburn Washburn University wash cabinet wash cell wash cement wash channel wash clean wash cloth

英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。