"Have a roller-coaster ride" nghĩa là gì?

Ví dụ 

Last week the roller coaster of crude oil (dầu thô) prices climbed to $89.47 on Thursday and $90 on Friday.

2004 BBC News: Business Shares have been on a rollercoaster ride, with US shares plunging (lao dốc) and then recovering twice over.

After she graduated from college, her life became a roller coaster ride filled with ups and downs as she tried to establish herself as a fashion designer.

Markets on both sides of the Atlantic have had a roller coaster ride over the past five days. The past week was an emotional roller-coaster ride for these people.