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roller coaster

noun
🔊/ˈrəʊlə kəʊstə(r)/
🔊/ˈrəʊlər kəʊstər/
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  1. a track at a fairground that goes up and down very steep slopes and that people ride on in a small train for fun and excitement（游乐场的）过山车，环滑车
    • a roller-coaster ride乘坐过山车
  2. a situation that keeps changing very quickly不断变化的局势
    • The last few weeks have been a real roller coaster.过去的几个星期，形势真是变幻莫测。🔊🔊
    • an emotional roller coaster情绪时好时坏