1 N-COUNT 过山车;云霄飞车 A roller-coaster is a small railway at a fair that goes up and down steep slopes fast and that people ride on for pleasure or excitement. 过山车;云霄飞车
2 N-COUNT [usually singular] 许多急转突变;忽好忽坏 If you say that someone or something is on a roller coaster, you mean that they go through many sudden or extreme changes in a short time. 许多急转突变;忽好忽坏 [journalism]
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I've been on an emotional roller-coaster since I've been here.
自从我到了这里，情绪就起伏不定。
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Over the last few years Japan's socialists have seen their electoral popularity take a roller-coaster ride.
在过去的几年里，日本社会党在选民中的支持率忽高忽低。