11.Be in a black mood 情绪极差

To be so negative about everything that it is impossible for anyone to reason with him/her

Example: My father has been in a black mood for days, we dare not say anything to him.

12.Feeling blue 感到无精打采

Feeling sad or depressed¹

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

13.New blood 新成员

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

Example: It was decided² to bring new blood into the school by employing teachers with the latest training.

14.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.

15.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.

16.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.

17.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 hauling³ people trapped in the building to safety.

18.By chance 偶然，意外的

Unexpectedly⁴; with no prior⁵ planning

Example: By chance, I bumped⁶ into my wife in the shopping mall.

19.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!

20.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.