名词

1. 激变；剧变；动乱
An upheaval is a big change which causes a lot of trouble, confusion, and worry.

1. disturbance usually in protest

Synonym: agitationexcitementturmoilhullabaloo

2. (geology) a rise of land to a higher elevation (as in the process of mountain building)

Synonym: upliftupthrowupthrust

3. a violent disturbance

e.g. the convulsions of the stock market

Synonym: convulsionturmoil

4. a state of violent disturbance and disorder (as in politics or social conditions generally)

e.g. the industrial revolution was a period of great turbulence

Synonym: turbulenceSturm und Drang