1、the third wheel：（俚）电灯泡，多余没用的人。

      a、It wasn't until I arrived at the party and met Suzie that I realized that I was the ~ on my friend's date.

      b、He felt like a ~ because he doesn't know how to cook.

2、to be on to sb./sth：识破意图

      a、After months of detective work, the police were finally ~ the plans of the criminals.

      b、Iwant to keep the birthday present a secret, but I think she is ~ me.

3、take it on the chin：忍气吞声

      a、When I found out you were lying to me, did you expect me just to ~ and move on?

      b、When he was fired for no reason, he took it on the chin and looked for another job.

4、off base：（俚）to be wrong about sth.出问题

      a、The report was well written, but it was slightly ~ .方向/立意/主题有点小问题。

      b、She was completely ~ in thinking that I have lied to her.认为我对她撒谎，那她可真是大错特错了。

5、grand：一千元 one thousand bucks

      a、At my first job out of university, I was making twenty ~ a year.

      b、If you have a child, it's very difficult to survive on thirty ~ a year in New York city.