Roller coaster
01
过山车, 云霄飞车
equipment consisting of seats attached to a sloping railway, on which people ride for fun in amusement parks
例子
They designed a new roller coaster with a 90-degree drop.
他们设计了一个新的过山车，带有90度的下落。
02
过山车, 情绪起伏
a situation or experience that involves significant ups and downs, sudden changes, or intense shifts in emotions, circumstances, or events
Idiom
Informal例子
The stock market can be a financial roller coaster, with daily fluctuations in value that keep investors on their toes.
股市可能是一个金融过山车，每日的价值波动让投资者保持警惕。
