[] an unexpected event such as a very bad accident, a flood or a fire that kills a lot of people or causes a lot of damage灾难；不幸◆an air/ferry/rail disaster空／海难；铁路灾难◆a natural disaster(= one caused by nature)自然灾害 [, ]a very bad situation that causes problems; a failure不幸；灾难；失败◆The company's expansion into the US proved to be a financial disaster.这家公司向美国市场的扩张已证明是一场经济灾难。◆The scheme ended in disaster.计划以失败告终。