英语词汇sand and gravel extraction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	sand and gravel extraction
释义	sand and gravel extraction 简明释义砂石精选网络释义 1 ?砂石精选砂石精选双语例句 1 Besides the storm tide impact, the main causes for coastal erosion are due to the continued decrease of material supply and manual extraction of sand and gravel. 海岸侵蚀的原因除风暴潮影响外，主要是海岸带物质补给来源持续减少和人工采挖砂石。
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