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hardpan n. 硬质地层,粘土层,砂砾层 硬质地层,粘土层,砂砾层 hardpan n 1: crust or layer of hard subsoil encrusted with calcium- carbonate occurring in arid or semiarid regions [synonym: {caliche}, {hardpan}] Hardpan \Hard"pan`\ (h[aum]rd"p[a^]n), n.
The hard substratum. Same as {Hard pan}, under {Hard}, a. [1913 Webster]
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