on Windows
\usepackage{CJK}
\begin{CJK}{GB}{gbsn} % Use default fonts from CJK (see below)
大漠孤烟直
\end{CJK}
On Mac
\usepackage{CJK}
\begin{CJK}{UTF8}{gbsn} % Use default fonts from CJK (see below)
长河落日圆
\end{CJK}
I don't know whether it works. I don't know why it works.