an event causing great and often sudden damage or suffering; a disaster
(常突如其来的)大灾难;大灾祸
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an environmental catastrophe 环境大灾难
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[mass noun]
leading the world to catastrophe .将世界引入劫难。
the denouement of a drama, especially a classical tragedy
(尤指古典悲剧的)结局。
"mid 16th cent. (in the sense ‘denouement’): from Latin