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Từ điển Oxford Advanced Learner 8th
roller coaster
ˈroller coaster [roller coaster roller coasters] BrE NAmE noun
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
•a roller-coaster ride
2. a situation that keeps changing very quickly
•The last few weeks have been a real roller coaster.
•an emotional roller coaster
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