雅思口语短语：
       1 Be in the air 将要发生的事情
　　The feeling or idea that something new is about to happen or is going to change.Example: From the arguments going on at the meeting, it seems that a change in policy is in the air.
　　2 Clear the air 消除误会
　　To settle a dispute and restore good relationsExample: We had a meeting with the workers, and I think we’ve cleared the air now.
　　3 Cost an arm and a leg 极其昂贵
　　To be very expensiveExample: I love that fur coat. However, I don’t think I’m going to buy it because it costs an arm and a leg.
　　4 A bad egg 缺乏道德的人
　　Somebody who has no moral principles and should be avoidedExample: You mustn’t lend Tim money, he’s a bad egg. You’ll never see him or your money again!
　　5 In the Bag 稳锻炼身体胜券
　　Said of an achievement which is secureExample: We have the deal in the bag. The client came in this morning to sign the agreement.
　　6 In the balance 未知的,不可预测的
　　Said when the outcome of a situation is unknown or unpredictableExample: His career as a pilot is in the balance, as his eyesight does not seem good enough.
　　7 Drive a hard bargain 极力讨价还价
　　To have the negotiating strength and skills to get the most advantageous price and conditionsExample: Amanda is negotiating the best price from the suppliers. She drives a hard bargain.
　　8 Ring a bell 看上去或听起来非常熟悉
　　To look, sound or seem familiarExample: That face rings a bell, where have I seen him before?
　　9 Tighten one’s belt 节衣缩食
　　To cut down on spending because there is less income than beforeExample: Now you are out of work, you’ll have to tighten your belt and give up buying new clothes and going out so often.