> 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/2020/04/02.md).

# 02

回顾过去就像是压缩弹簧，每有所退，必有所进。

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