> 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/2021/12/18-abstract.md).

# 18, 抽象

十年埋珠玉，默默无痕迹

寂寂不生发，寻常难再忆

![](/files/oHZshd8ijTQOvScpc1lC)