My pick is nvi, which I find a little more comfortable and familiar with the ever-present vim.

我选择的是nvi，我觉得它比一直存在的vim更好用和更熟悉一些。

There is an excellent tutorial on vi in /usr/src/contrib/nvi/docs/tutorial, if you have the system sources installed.

如果你已经安装了系统源代码，在/usr/src/contrib/nvi/docs/tutorial有一份极好的关于vi的指南。