on the ball 精明的

【讲解】

该短语源于棒球运动，指在棒球运动中，球员机瞀，全神贯注地看球，随时准备击球。后来用on the ball比喻“机警，干练，敏徒”。

【对话】

A:If you keep your eye on the ball, you will surely succeed.
A:如果你专心，你一定会取得成功。
B:But I am unconfindent of myself.
B:但我不够自信。
A:If you aim at doing something,just keep it on. And sooner or later you'll make it. You should be confidentand consistent. Please keep it in mind.
A:如果你决定做什么事，一定要坚持下去，迟早会成功的。你必须有信心有耐力，请记住这一点。
B:OK. I'll try.
B:好吧，我会努力的。