平流层的硫是火山喷发的自然结果，这种硫每吨比燃烧煤释放的硫能造成更强的冷却效应。
Sulphur in the stratosphere, a natural result of volcanic eruptions, provides a lot more cooling per tonne than the coal-emitted sort.
在诸如地震、飓风、热带风暴或者是火山喷发等严重自然灾难一旦发生之后，医院的卫生服务对于幸存者而言是生死攸关的。
Their services are vital in the immediate aftermath of a severe natural event such as an earthquake, hurricane, cyclone or volcano eruption.
在火山喷发的过程中，形成了不多见的户外实验室，研究人员曾经通过这样的实验来解释一个日趋紧迫的问题：在经过如此猛烈的冲击之后，大自然是如何恢复它的地形地貌的？
In the process, it also created an unusual outdoor laboratory where researchers have worked ever since to answer an increasingly urgent question: How do landscapes recover after violent disturbance?
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