The fifth is assigned to crack shaft (with the doline in the same seam).
五是地缝配竖井(坑与地缝相通)。
The fifth is assigned to crack shaft (with the doline in the same seam).
五是地缝配竖井(坑与地缝相通)。
Fourth, Fifth, Fei Bao underground river next to crack doline distribution.
四是暗河接飞瀑 五是地缝配坑。
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