“冲积层”造句

砂矿开采: 从冲积层回收黄金的最古老方法.
Placer mining: Oldest method of recovering gold from alluvial deposits.

简要分析了位于巨厚冲积层表土下,竖井破坏的特点及力学机理.
The characteristic and mechanical mechanism of shaft failure under mega - thick alluvial surface layer are briefly analysed.

上部主要是近代河流冲积层, 下部为倾 状 冲积层.
The upper part of the main river alluvium in modern times, the lower the pour - shaped alluvium.

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