roller coaster

n.
1.（游乐场的）过山车，环滑车
2. 不断变化的局势

同：	[n.] big dipper, chute-the-chute

anything characterized by abrupt and extreme changes (especially up and down)
- the economy has been on a roller coaster all year
elevated railway in an amusement park (usually with sharp curves and steep inclines)
[同] big dipper, roller coaster, chute-the-chute

开心词场背单词

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