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       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: Baseball is beginning to be in the air in China. 棒球运动在中国风行起来。

　　2.Clear the air 消除误会

　　To settle a dispute and restore good relations

　　Example: If they clear the air, they will be able to see more clearly and solve their problems. 当真相被澄清，误会被消除，他们就能够更清晰地看待问题并恰当处理。

　　3.Cost an arm and a leg 极其昂贵

　　To be very expensive

　　Example: She saw a beautiful coat but it cost an arm and a leg. 她看到了一件漂亮的上衣，但它的价格昂贵。

　　4.A bad egg 缺乏道德的人;坏蛋

　　Somebody who has no moral principles and should be avoided

　　Example: At first I trusted him, but soon I found he's a bad egg.

　　起初我信任他，但不久就发现他是个坏蛋。

　　5.In the Bag 稳操胜券

　　Said of an achievement which is secure

　　Example: Our basketball team has been training for quite a while. They have the game in the bag. 我们的篮球队训练了一个阶段，这场比赛他们是稳操胜券了。

　　6.In the balance 未知的,不可预测的;悬而未决

　　Said when the outcome of a situation is unknown or unpredictable

　　Example: Nevertheless, the future of Italy hangs in the balance. 不过，意大利的前途还是未知的。

　　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 conditions

　　Example: His ability to drive a hard bargain has often brought conflict. 他讨价还价的能力经常引发冲突。

　　8.Ring a bell 看上去或听起来非常熟悉

　　To look, sound or seem familiar

　　Example: James Carson-the name ring a bell, I've heard it before.

　　詹姆斯卡森——这个名字听起来很熟悉，我以前听说过。

　　9.Tighten one’s belt 节衣缩食

　　To cut down on spending because there is less income than before

　　Example: There's only one way out of this. You're going to have to change your lifestyle, tighten your belt and keep tightening it. 这种情形，只有一种出路。你必须要改变你的生活方式，节衣缩食，并且这样继续下去。

　　10.Kill two birds with one stone 一石二鸟;一举两得

　　To complete two tasks together, with less effort than doing them separately

　　Example: I always get my nails manicured while I get my hair cut, that way I can kill two birds with one stone. 每次我去剪头发的时候都会修指甲，这样我可以一举两得。