释义
n.
a fairground attraction that consists of a light railway track which has many tight turns and steep slopes on which people ride in small fast open carriages
（游乐场的）环滑车道；环滑车。
〈喻〉 急转突变
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a terrific roller coaster of a book .一本书中绝妙的急转突变事件。
v.
move, change, or occur in the dramatically changeable manner of a roller coaster
大起大落；急转突变
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the twentieth century fades behind us and history roller-coasters on .２０世纪消失在我们身后，历史将继续在变幻莫测中向前发展。
