塌陷

The weight of the snow caused the roof of the cabin to cave in.

雪的重使得小屋的屋顶。

They caved in the roof of the underground passage with powerful explosives.

他们用强大的炸药把地下通道的顶部炸。

Due to overpumping groundwater, hazard of mantled karst collapse may often take place there.

因过抽取地下水，造成覆盖型岩溶灾害。

Or the universe might even recollapse if dark energy density falls to a negative value.

当然宇宙也有可因为密度降为负值，而再度。

After the heavy rains part of the road subsided.

大雨过后, 部分公路。

His cellar caved.

他的地窖。

The road caved in.

道路成穴。

Air hole, burnthrough, cooapse and welding crackle occurred in the fixed overhead weld for aluminium and aluminium alloy tubes, above all the small-size thin wall tube.

针对铝及铝合金管,特别是小口径薄壁管固定口仰焊部位易出现气孔、烧穿、及焊接热裂纹等问题,分析问题存在的原因,从焊接工艺方面入手,提出一套消除气孔及烧穿的操作手法。