> For the complete documentation index, see [llms.txt](https://www.oulan.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.oulan.com/2016/11/21-zhong-fu-jiu-de-zuo-fa-zhi-hui-de-dao-jiu-de-jie-guo.md).

# 21，重复旧的作法，只会得到旧的结果

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