heaving bottom 冻胀土基
heaving of the bottom 基坑底隆胀
If it occurs in this river valley but not downstream, then the water is being held back in some way by a heaving river bottom.
如果洪水发生在河谷但不是下游，那么水在某种程度上是被起伏的河底阻挡住而涌回来。
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