> 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/2017/08/12.md). # 12 书上说得好：条条大路通罗马。每个人心里的罗马城也是不一样的。关注自己的罗马。早安，世界。早安，未来。早安，周末愉快。