1.Feeling blue 感到无精打采

Feeling sad or depressed

Example: She’s feeling blue, because the man she loves is far away.

2.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.

3.Get to the bottom of something 弄清真相

To find out the truth about something

Example: I’m trying to get to the bottom of why David left without saying goodbye.

4.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.

5.Pay a call 拜访

To visit somebody

Example: As we’re in this neighborhood, we might as well pay the Jacksons a call, we haven’t seen them for ages.

6.Round the clock 夜以继日的

To do something continuously, without a break or pause

Example: The ambulance services worked round the clock hauling people trapped in the building to safety.

7.By chance 偶然，意外的

Unexpectedly; with no prior planning

Example: By chance, I bumped into my wife in the shopping mall.

8.Keep one’s cool 保持冷静

To stay calm in a difficult situation

Example: If the traffic is jamed, the only thing to do is keep your cool, or get out of the car and walk!

9.In a tight corner 处于困境

In an extremely difficult situation

Example: Whenever I get into a tight corner, I try to rely on quick thinking to get out of it.