或者因流水對岩石的侵蝕和溶蝕所造成河床有地勢差，這些都能使河流產生瀑布

或者因流水對岩石的侵蝕和溶蝕所造成河床有地勢差，這些都能使河流產生瀑布。

結果 (英文) 1:

Or the river bed has a difference in topography caused by the erosion and dissolution of rocks by flowing water, which can cause the river to produce waterfalls.

結果 (英文) 2:

Or because of the erosion and erosion of rocks caused by flowing water, the riverbed has a poor terrain, which can cause the river to produce waterfalls.

結果 (英文) 3:

Or because of the erosion and dissolution of rocks by flowing water, the riverbed has poor topography, which can make the river produce waterfalls.