Shock waves can form when energy is quickly put into a confined channel; weak shock waves can be formed as trains enter tunnels.

当能量在瞬间通过一个限制性通道时，冲击波就会形成；火车在穿越隧道时就能产生微弱的冲击波。

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This process can be seen in a movie of the Eyjafjallajokull volcano where the shock waves propagating in the smoke are followed by the rise of dark ash clouds into the atmosphere.

这个过程可以在埃亚非德拉火山记录片中看到：冲击波在在浓烟中扩散，携带着黑暗的火山灰云进入大气层。

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Could it possibly be that the purpose of the survey is to shock people who enjoy Chinese takeaways into buying LIPObind, rather than to discourage unhealthy eating?

这项研究的目标可能是使那些喜欢中式外卖的人群受到惊吓，转而投向LIPObind，而不是阻止不健康的饮食？

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The Conservatives have warned that town halls could face a "massive financial shock" and be forced into council tax hikes or cuts in local services.

BBC: Councils 'not reckless with cash'

Regulating the types of models that can be used may be a good way to "shock" the system into making changes, she says.

BBC: Are thin women the enemy?

If, as I mentioned on Friday, the latest EU council has failed to solve the eurozone debt crisis in a sustainable way, what could shock eurozone governments into effective evasive action - or, in a worst case, be the explosion that causes the disintegration of the eurozone?

BBC: Why banks are eurozone's fault line