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同义词: hardpan
以上来源于: WordNet
N a bed of sand or clay in arid regions cemented by calcium carbonate, sodium chloride, and other soluble minerals 钙积层 (Also called calcrete)
Out there in the desolate, lunar like desert of northern Chile is a mineral-rich ore called caliche -- once known as white gold.
FORBES: Patricio Contesse's white gold
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