Bombarded by heat and particles from the sun, the sulfur would have evaporated, leaving the rock in which it was embedded to crumble, forming the hollows.

受到来自太阳粒子和热力的攻击，硫会蒸发殆尽，只剩下陷入崩塌的岩石，从而形成洞穴。

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If you dropped it, it would crumble flat but regain its shape flawlessly the moment you picked it up.

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It would have been easy for Wales, short on confidence and experience, to crumble after the early setback.

BBC: Wales 0-2 Germany

In other words, If Livestrong was going to crumble under the mountain of scandals and deception now synonymous with Armstrong, it probably would have happened by now.

CNN: Livestrong likely to survive Armstrong doping admission