She has a quick mind.

她头脑反应快。

youdao

He has a quick mind and speaks very fast.

他脑子转得快，说话也特别快。

youdao

He had a quick mind, and answered all the questions put to him by the reporter.

他反应很快，回答了记者提出的所有问题。

youdao

Van Buren had a quick mind and was a good judge of men.

VOA: special.2009.01.01

Blessed with a quick mind, capable of the deepest of incisions, Friedman also had the patience for meticulous statistical labour.

ECONOMIST: Milton Friedman

The woman who has been called the "Cal Ripken of Broadway" is a petite, stunning woman with a lightning-quick mind who started as an actress and turned into an entrepreneur.

WSJ: Behold: Catherine Russell the off-Broadway force

The quest for the constantly new was driven by a lightning-quick mind and short attention span for anything that failed to interest him, the fear of boredom, and an insatiable need for intellectual stimulation.

WSJ: Philip Johnson: Short of Attention Span, Long on Aesthetics