> 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/2018/10/15.md). # 15 想想吧。这世界上的事情，哪个易？哪个难？山据说难移，海据说难填。可是看看这海，看看这山。所以有些事情，只要是你想，便能实现。早安，世界。早安，未来。早安，如你所想，如你所愿。