Two people stuck in quick sand can't help each other.
两个陷入流沙的人是不可能互助的。
To settle loose bed, quick sand and ingress of groundwater are trouble some problems during coalmine construction.
如何解决煤矿建井中的松散层、流沙和地下渗(涌)水是目前建井工程中的棘手问题。
To settle loose bed, quick sand and ingress of groundwater are trouble some problems during coalmine construction.
如何解决煤矿建井中的松散层、流沙和地下渗(涌)水是目前建井工程中的棘手问题。
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