> 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/2017/04/21.md).

# 21

你可能需要一个契机。早安，世界。早安，奇迹即将发生的你。

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