pe·ne·plain /ˈpinɪˌplen, ˈpɛ-/
準平原
Pe·ne·plain n. Phys. Geog. A land surface reduced by erosion to the general condition of a plain, but not wholly devoid of hills; a base-level plain.
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peneplain
n : a more or less level land surface representing and advanced
stage of erosion undisturbed by crustal movements [syn: peneplane]