B-4：bank on/upon 依赖 A：Are you sure of your success in this election? A: 你对这次选举的成功有把握吗？ B: No. I cant bank on their support. B：没有。我不能指望他们的支援。 A: Why? A: 为什么？ B: Becaus...

B-3：bag 逃课 A：John bagged class yesterday．Do you know what happened to him? A：约翰昨天逃课了。你知道发生了什么事情吗？ B：I hear his girlfriend came to see him from abroad． B：我听说他的女朋友从国外...

B-2：back up 支持 A: I decide not to buy the mobile phone. A: 我决定先不买手机了。 B: But you told me yesterday you would. B: 可昨天你还说你会买。 A: I have changed my mind. A: 我改主意了。 B: Whats wrong? B：怎...

B-1：back down 打退堂鼓 A: He has backed down from his intention to go to America. A: 他已经放弃了去美国的打算。 B: Because of what? B: 为什么？ A: Money, of course. Its the matter. He wants to realize his American dre...

A-21：at sea 不知所措 A：Im all at sea in Professor Blacks lectures. A: 听布莱克教授的课我是一片茫然。 B: Are you? I like his lectures. B：真的？我喜欢听他讲的课。 A: Can you give me some suggestions? A: 能给...

A-20：at ones elbow 很近 A: Thank you for lending me the book. A: 谢谢你借书给我。 B: Sure. But its a very difficult one, you need to have a dictionary at your elbow. B：不用谢。可这本书非常难，你手边需要一本字...

A-19：at it 明知故犯 A：Tom is late again. A: 汤姆又迟到了。 B: Hes at it again,isnt he? B：他明知故犯，不是吗？ A: You should give him a lesson. A: 你应该给他点儿教训。 B: But hes only a tartar. B：但他是...

A-18：at all 一点 A：Mind if I borrow your economics notes for a while? A: 可以借你的经济学笔记用会儿吗？ B: Not at all. You didnt take any notes today? B：当然可以。你今天一点儿也没记吗？ A: No,I was too...

A-17：as yet 到这一时刻为止 A：Whats your job? A: 你是做什么工作的？ B: My job? I havent finished school as yet,but I will next year. B: 我的工作？我还没毕业呢，不过明年就毕业了。 A: What kind of job d...

A-16: around the corner 在近处 A：The summer vacation is just around the corner.I wonder what youre going to do. A: 暑假马上到了。你准备干什么？ B: Help Mum with the housework,call on a few friends,do some physical exercis...