核心问题
a genius for, a genius in 和 a genius at 在使用上有无区别?
词典解答
a genius for 是指“某方面的天才(天赋)”, 而 a genius in (at) 是指“某方面、某领域的天才人物”。例如：
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He has a real genius for poetry. 他具有真正的诗才。
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He has a genius for music (language, invention, painting, mathematics). 他具有音乐（语言、发明、绘画、数学）天才。
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A great actor has a genius for acting. (Thorndike) 伟大的演员具有表演天才。
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J. p. Morgan was a genius in finance. J. p. 摩根是金融界的天才(人物)。
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He is considered to be a budding genius at maths. (Worrall) 他被看作是初露头角的数学天才。