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A broad gently sloping rock surface at the base of a steeper slope often covered with alluvium formed primarily by erosion. 山前侵蝕平原，麓原一種由侵蝕引起的在另一陡的傾斜底麪上的寬而緩緩傾斜的巖石層麪，其上通常覆蓋著沖積土。