1、Ring 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?

　　2、In the Bag 稳锻炼身体胜券

　　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.

　　3、Cost 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.

　　4、New blood 新成员

　　New people brought into an organization to introduce different and original ideas

　　Example: It was decided to bring new blood into the school by employing teachers with the latest training.

　　5、A piece of cake 轻松的事

　　Something which is very easy to do

　　Example: Here…let me put the batteries in for you. It’s a piece of cake.