> 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

![](https://385430918-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-M8iFCzaIpXf8zXqpE6I%2Fuploads%2Fbs4oqgc3nDWG2dtTJ0t3%2Fimage.png?alt=media\&token=5dc40a95-9d82-4bd3-a7d7-1b92b7c4b19d)