> 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/2017/06/23.md).

# 23

前进一步是未来，后退一步是安全。可以预知，不能期待。早安，世界。早安，未来。早安，努力中的你。

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