Setbacks
周折
??? 情景例句
What was that?
你說什么？
I read the newspaper over breakfast.
我邊吃早飯邊看報紙。
So the number of stars that we know exist is now estimated at about 300 million million million.
因此，我們所知道的現有恒星數目估計約有30億×1000億顆。