> 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/2016/11/10.md).

# 10

你只有一双脚，不能同时跳两场舞。

![](https://385430918-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-M8iFCzaIpXf8zXqpE6I%2F-MCbZFu47u6ntoLgmz5k%2F-MCbZVaGVDU7IysZ5Vsk%2F20161110.jpeg?alt=media\&token=fee7d86f-6bc2-4a96-87c5-b9bbf478425d)