Regional volcanic strata are the source of placer gold and laterization process is the main stage of formation of placer gold.
区域地层是砂金的矿源,地表赤红壤化可能是砂金形成的主要段。
Regional volcanic strata are the source of placer gold and laterization process is the main stage of formation of placer gold.
区域地层是砂金的矿源,地表赤红壤化可能是砂金形成的主要段。
声明:以上例句、词性分类均由互联网资源自动生成,部分人工审核,其表达内容亦不代表本软件的观点;若发现问题,欢迎向我们指正。