A nearly flat land surface representing an advanced stage of erosion.
A nearly flat land surface representing an advanced stage of erosion.
准平原一种因晚期侵蚀作用而形成的近似平坦的地面
A nearly flat land surface representing an advanced stage of erosion.
准平原一种因晚期侵蚀作用而形成的近似平坦的地面