1Be 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 relations

Example: We had a meeting with the workers, and I think we’ve cleared the air now.

3Cost an arm and a leg 极其昂贵

To be very expensive

Example: I love that fur coat. However, I don’t think I’m going to buy it because it costs an arm and a leg.

4A bad egg 缺乏道德的人

Somebody who has no moral principles and should be avoided

Example: You mustn’t lend Tim money, he’s a bad egg. You’ll never see him or your money again!

5In the Bag 稳操胜券

Said of an achievement which is secure

Example: We have the deal in the bag. The client came in this morning to sign the agreement.

6In the balance 未知的,不可预测的

Said when the outcome of a situation is unknown or unpredictable

Example: His career as a pilot is in the balance, as his eyesight does not seem good enough.

7Drive 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: Amanda is negotiating the best price from the suppliers. She drives a hard bargain.

8Ring a bell 看上去或听起来非常熟悉

To look, sound or seem familiar

Example: That face rings a bell, where have I seen him before?

9Tighten one’s belt 节衣缩食

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

Example: Now you are out of work, you’ll have to tighten your belt and give up buying new clothes and going out so often.

10Kill two birds with one stone 一石二鸟

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

Example: Since I’d gone to the store to buy some bread, I thought of killing two birds with one stone and invited Mr. Biggs to the party.

(编辑：何莹莹）