He is a teacher who is really on the ball.他是個了不起的老師。a manager who has a lot on the ball很懂行的經理; a student who has nothing on the ball 學得一塌糊塗的學生

另一個說法表示一個人“能幹”，可以說hot-shot：The boss would like to hire a hot-shot employee 能幹的職員 a hot-shot teacher, 能幹的老師，

Ball的第三個用法是having sex：They met, they clicked, they are having a ball.

I am glad you have started the ball rolling.很高興你把這事推動起來了。

113．Blur 模糊，Taiwan talk is just a blur. 臺灣問題的討論不過是在攪混水。The next hour is a blur to me.接下來的一個小時我就稀裡糊塗了。

114．I have worked my butt out.我幹活幹得筋疲力盡了。中國人“我幹這活都掉了兩斤肉。”英語裡是累得屁股都掉了。

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