on the ball

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敏銳;機警

8 部電影說過 · Dr. Strangelove or: How I Learned to Stop Worrying and Love the Bomb
No, I don't, sir. Let's see if we can stay on the ball.
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    on the ball 是什麼意思、怎麼用 · 8 部電影原聲 · 出自電影 Dr. Strangelove or: How I Learned to Stop Worrying and Love the Bomb (1964)