In Massachusetts, the weight of the snow caused a partial roof collapse at this garage.

在马萨诸塞州的这个车库，积雪的重量使得部分房顶倒塌。

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Natural sinkholes generally form when heavy, water-saturated soil causes the roof of an underground limestone cavity to collapse, or when water widens a natural fracture in limestone bedrock.

一般自然灰岩坑形成机理是由于有份量的水饱和土导致地下石灰岩洞顶层坍塌，或者由于水加宽了石灰岩床的天然裂缝而导致。

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Hundreds of rescuers in southern Germany are desperately searching Tuesday for survivors of a roof collapse at an ice-skating rink in Bavaria.

数百名救援人员星期二在德国南部的巴伐利亚的一处滑冰场竭尽全力搜寻屋顶塌陷事件幸存者。

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That was followed by a collapse of a roof panel at the stadium on May 27 after rainwater collected on the roof.

WSJ: World Cup 2014, Brazil, Maracan? Stadium: Brazil's Rush to Get Ready for the World Cup

Fleur El-Hspa, owner the Picasso Express restaurant which had to close due to the roof collapse, said regeneration plans had been in the pipeline "for a couple of years".

BBC: Langney roof collapse