> 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/2017/12/21.md). # 21 机会是气球也是风险。有破的可能，也会画一条飞得更高的轨迹。抓住，或者松手。无法预测会发生什么。早安，世界。早安，未来。早安，你的气球。