重点讲解：
1. on a roll
连连成功；连交好运；
eg. I made a name for myself and I was on a roll, I couldn't see anything going wrong.
我靠自己的能力成名了，接二连三地获得成功，我觉得一切似乎一帆风顺。
eg. Things are going great now! I'm on a roll!
事情进行得很顺利！我好运正旺！
2. at the moment
目前；现在；
eg. At the moment there's no hard and fast timetable.
目前还没有明确的时间表。
eg. I think she feels desperately wounded and unloved at the moment.
我想她此刻定会觉得受到了极大的伤害，无人关爱。
3. had better/'d better do sth.
（用于建议、警告、威胁、发表意见等）最好做某事；
eg. Perhaps you and I had better change over; you are more experienced.
也许我们的工作还是对换一下好，你比我更有经验。
eg. I think you'd better tell us why you're asking these questions.
我想你最好告诉我们你为什么要问这些问题。
