The dating of planation surface is still an intractable problem.
而另一方面，夷平面的定年仍是一个棘手的问题。
As important constituent of planation surface, the weathering crust is the spot of planation surface research to cut into.
作为夷平面的重要组成部分，风化壳是夷平面研究的切入点。
As important constituent of planation surface, the weathering crust is the spot of planation surface research to cut into.
作为夷平面的重要组成部分，风化壳是夷平面研究的切入点。
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