CEDICT
disaster; calamity; catastrophe (Classifier: 場／场; 次; 種／种)
Wiktionary
嚴重麻煩或危害性很大的事情。
重編國語辭典
classifiers: 件, 樁, 回
Optimists see opportunities in disasters while pessimists find disasters in every opportunity.
Source: Tatoeba