什麼是「think on one's feet」？用腳思考？站著思考？
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「腳」是支撐起整個身體、並肩負行動能力的重要部位，
我們通常會用 on one's feet 來表達「站著」，
而「think on one's feet」指的就是一個人能夠一邊行動、一邊思考，衍伸來說就是能夠「隨機應變、反應靈敏」的意思！
例句：
Louis had to think on his feet when someone asked him a question he didn't expect.
當有人問的問題不在路易斯的意料之中時，他得要隨機應變。