3b1b-manim/manimlib/tex_templates/ctex_template.tex

\documentclass[preview]{standalone}
\usepackage[UTF8]{ctex}

\usepackage[english]{babel}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{dsfont}
\usepackage{setspace}
\usepackage{tipa}
\usepackage{relsize}
\usepackage{textcomp}
\usepackage{mathrsfs}
\usepackage{calligra}
\usepackage{wasysym}
\usepackage{ragged2e}
\usepackage{physics}
\usepackage{xcolor}
\usepackage{microtype}
\linespread{1}

\begin{document}

[tex_expression]

\end{document}