核心问题
Added to that, he was no good at maths and so he was asked to leave school, his teacher saying he was incapable. 上句中的 no good 与 not good 有无区别?
词典解答
no good at 和 not good at 中的 good 虽然都是形容词,但是,它们的意义是不同的。not good at 是 good at 的否定式,意为“不擅长于”,而 no good at 则意为“在……方面极糟”“对……一窍不通”。