“underclay”的概念、定义、翻译、参考文献-科学参考

单词	underclay
释义	underclay [`ǝn·dǝr´klā] ^GEOLOGY A layer of clay or other fine-grained detrital material underlying a coal bed or comprising the floor of a coal seam. Also known as coal clay; root clay; seat clay; seat earth; thill; underearth; warrant.
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