过山车...

roller coaster的音标：roller coaster的英式发音音标为：['rəulə 'kəʊstə]roller coaster的美式发音音标为：['rolɚ 'kostɚ]...

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。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。It's great to go on the roller coaster five times and not b...