The job required a subtle mind.

那项工作需要一个头脑敏锐的人去做。

《牛津词典》

The work bespeaks a subtle eye, a sober mind, and an ardent heart.

NEWYORKER: Shapes of Things

Picking the right dividend stocks is subtle though, and requires, ironically, a fixed-income mind-set.

FORBES: Dividend Stocks With Staying Power

Maybe the subtle mind of the government Chief Whip, Sir George Young, will find a way to induce the minor parties to side with the Conservatives, but it seems to me that the main impact of the vote will be to poison Coalition relations.

BBC: Week ahead