> 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/2021/04/21-engage.md).

# 21, 钻研

石墙高百尺，叠叠负何巨？\
树成不盈寸，一裂为根系。\
初生乃嫩弱，石缝堪汲取，\
我等生世间，何事怨贫瘠？

![](/files/-MYlMYxuH5BYY0C6BAVN)