> 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/2017/12/22.md). # 22 冬天的早上在这南方城市的边缘，红彤彤的太阳傲娇的爬在云端。所有已知的未知的仿佛一刹那穿过黎明年前的暗色来到眼前。知识就是阶梯。它一直在那里。早安，世界。早安，未来。早安，你的阶梯。