mo·men·tous
adjective/məˈmentəs/
/məʊˈmentəs/
- very important or serious, especially because there may be important results
关键的；重要的；重大的 - a momentous decision/event/occasion
重大决定／事件；重要时刻 - At the same time, momentous events were taking place in Russia.
与此同时，俄罗斯正在发生重大事件。
Oxford Collocations DictionaryMomentous is used with these nouns:- change
- decision
- event
- …
- a momentous decision/event/occasion