N-COUNT
激變；劇變；動(dòng)亂
An upheaval is a big change which causes a lot of trouble, confusion, and worry.
例句
Wherever there is political upheaval, invariably there are refugees...
哪里有政治動(dòng)亂，哪里就一定有難民。
Having a baby will mean the greatest upheaval in your life.
有了孩子意味著你的生活要發(fā)生重大的變化。