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Here is a simple example that will probably show you all you need to know about bold, italics, and underlining.
When something is \emph{really}, \textbf{really} important, you can \underline{underline it}, \emph{italicize it}, \textbf{bold it}. If you \underline{\textbf{\emph{must do all three}}}, then you can nest them. 原文出处：Netkiller 系列 手札 本文作者：陈景峯 转载请与作者联系，同时请务必标明文章原始出处和作者信息及本声明。