自然灾害是给人类及其设施带来严重灾难的危害。
Natural disasters are calamities which bring about enormous damage to human beings and their accommodations and equipments.
奥巴马称这次地震是西半球遭受的最严重灾难之一。
Obama described the earthquake as one of the most devastating disasters to strike the hemisphere.
仅就统计来看，卡特里娜是降临在美国的最严重灾难之一。
In statistics alone, Katrina was one of the worst disasters to befall the United States.
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