... undercharge非饱和充电；缺荷 underclay底粘土 undercoat底涂层 ...
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... 下伏岩层 underburden 底黏土 underclay 底黏土石灰岩 underclay limestone ...
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underclay uc 低粘岩
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N a grey or whitish clay rock containing fossilized plant roots and occurring beneath coal seams. When used as a refractory, it is known as fireclay 底层粘土
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