He is a teacher who is really on the ball.他是个了不起的老师。a manager who has a lot on the ball很懂行的经理; a student who has nothing on the ball 学得一塌糊涂的学生

另一个说法表示一个人“能干”，可以说hot-shot：The boss would like to hire a hot-shot employee 能干的职员 a hot-shot teacher, 能干的老师，

Ball的第三个用法是having sex：They met, they clicked, they are having a ball.

I am glad you have started the ball rolling.很高兴你把这事推动起来了。

113．Blur 模糊，Taiwan talk is just a blur. 台湾问题的讨论不过是在搅混水。The next hour is a blur to me.接下来的一个小时我就稀里糊涂了。

114．I have worked my butt out.我干活干得筋疲力尽了。中国人“我干这活都掉了两斤肉。”英语里是累得屁股都掉了。

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