This works in both directions: beggars become kings, palaces collapse into shelters.
这是双向的:乞丐变成了国王,宫殿坍塌成了避难所。
The most likely answer is dual collapse into a lava tube.
最有可能的答案是熔岩坍塌导致的。
Someday this pillar might fail, and the tunnel we stand in May collapse into the one below it.
然后她做了一个前进的手势。某天这条支柱可能会倒塌,而我们现在所在的这条隧道可能会坍塌进下面的另一条。
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