全神贯注

提高警惕

机灵

be on the boil───勃然大怒

on the ball───adv.机灵；留心；有见识；勤奋

be in the black───（银行存款）有盈余；有存款

be on the wagon───喝酒

fly on the wall───n.未察觉的观察者

be in the hole───亏空

be in the wars───参战

be in the wash───受洗

be on the spot───在场

Ex: "You need to be on the ball in this job".───例句：你在这份工作上要够机灵。

My manager expects the team to be on the ball when we have to answer clients.───我的经理希望团队在回答客户的问题时反应迅速。

Mr. J hopes that what he has been writing will be on the ball.───J 先生希望他所写的文章都很出色。

But I would like to try a different kind of life. I prefer to be on the ball.───但是我想尝试另外一种生活，一种忙碌的生活。

A traffic police officer has to be on the ball and resolve problems quickly.───交通警察必须很有警觉性，能很快地解决问题。

As a politician, you must be on the ball in the election.───你是一名政治家，必须在选举中时刻警惕。

Mr. J hopes that what he has been writing will be on the ball.───先生希望他所写的文章都很出色。

If you want to finish this on time, you must be on the ball───如果你想及时完成这工作，就得干劲十足。

But I would like to try a different kind of life. I prefer to be on the ball.