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单词 hardpan
释义 hardpan
 /hahrd"pan'/,  n.  
  1. any layer of firm detrital matter, as of clay, underlying soft soil. Cf. caliche, duricrust.
  2. hard, unbroken ground.
  3. the fundamental or basic aspect of anything; solid foundation; underlying reality: the hardpan of mathematical theory.
 [1810-20, Amer.; HARD + PAN1]
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