准平原
Peneplain \Pe"ne*plain`\, n. [L. paene, pene, almost + E. plain.] (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.
peneplain n : a more or less level land surface representing and advanced stage of erosion undisturbed by crustal movements [syn: {peneplane}]