She was quick-witted and had an extraordinarily agile mind.

她很机智并且有一个特别敏锐的头脑。

《柯林斯英汉双解大词典》

"Sharp" meant genuinely discerning, alert, acute rather than quick-witted or clever.

“Sharp”的意思是真正具有辨识力、警觉、敏锐，而不是机敏或聪明。

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Under these rules no politician, no matter how quick-witted, can win.

在这样的规则下，无论多么机敏的政客都将落败。

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The police minister didn't help himself by arriving late to deliver his statement - an attempted point of order from a quick witted backbencher provided just enough cover to allow him to scramble into position as a puzzled and irate Speaker Bercow scanned the horizon.

BBC: Police minister Nick Herbert under pressure over bail

For the sharp-penned and quick-witted in those days the globe was there for trotting.

ECONOMIST: England, America and the politics of dissent

Joel Edgerton's Patrick, the SEAL squadron's leader, is a bit of a cowboy, though quick-witted and unerringly competent.

WSJ: In 'Zero Dark Thirty,' Zealotry in Pursuit of Zealots