John's not very good practically. He's too intellectual.约翰动手能力不是很强。他更善于动脑。Elderly people are told that if they want to keep their minds nimble, they must use them.老年人被告知，要想保持头脑灵敏，就必须要多动脑。If you don't keep your brain working, you go gaga.你要是不经常动脑，你会老糊涂的。