问题: 翻译
this pattern forms in areas where there are alternating bands of variable resistance, and by that i mean the bands of rock that are very strong and resistant to erosion alternate with bands of_rock that are weak and easily eroded.
解答:
alternate,交替出现，楼上的其他部分翻得还比较到位，就差这个alternate没译对，也就全盘皆输了，那个词很重要的。还有 by that i mean 我意思是
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