核心问题
请说明 improve in 与 improve on 的区别。
词典解答
improve in 是在“在……方面有改进或提高”：
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He's improving in health. (LDCE) 他的健康状况有好转。
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Most of their products have considerably improved in quality. 他们的大部分产品在质量上有重大改善。
improve on 则是指“对……改善”“超过”：
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They improved on his method. 他们对他的方法进行了改良。
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Tom has never improved on his first book, which had a wild success. 汤姆自处女作获得极大成功以后从未有新的突破。