In ctexbook document class, when I write a chapter, the word "chapter" is in English

Question

I am writing a Chinese book using ctexbook, but when I used the chapter command, it does not write the word "chapter" in Chinese. Here's my code:

\usepackage[a4paper, total={6in, 9in}]{geometry}
\usepackage[utf8]{inputenc}
\usepackage{graphicx}
\usepackage{multirow}
\usepackage{longtable}
\usepackage{array}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{amsthm}
\usepackage{float}
\usepackage{txfonts}
\usepackage{pxfonts}
\usepackage{lmodern}
\usepackage[dvipsnames]{xcolor}
\setlength{\parindent}{0pt}
\usepackage{tkz-base}
\usepackage{tikz}
\usepackage{tkz-euclide}
\pagestyle{plain}
\setlength{\unitlength}{0.5cm}
\usepackage{accents}
\newcommand{\varvec}[1]{\underaccent{\tilde}{#1}}
\newcommand{\placenum}[1]{\makebox(1,1){#1}}

\newcommand*\circled[1]{\tikz[baseline=(char.base)]{
            \node[shape=circle,draw,inner sep=1pt] (char) {#1};}}
\usetikzlibrary{arrows}
\makeatletter
\pgfkeys{
  /tkzlabelX/no zero/.style={
    /tikz/xlabel style/.append style={
      style/.expand once={\ifdim\tkz@pos pt=0pt shape=coordinate\fi}}},
  /tkzlabelY/no zero/.style={
    /tikz/ylabel style/.append style={
      style/.expand once={\ifdim\tkz@pos pt=0pt shape=coordinate\fi}}},
  /tkzAxeXY/no zero/.code=, /tkzdrawX/no zero/.code=, /tkzdrawY/no zero/.code=,
  /tkzlabelX/make an O/.style={
    /tikz/xlabel style/.append style={
      style/.expand once={\ifdim\tkz@pos pt=0pt
        shape=rectangle, fill=none, fill/.code=, % no filling, please
        pos=.5, yshift=+3pt, anchor=south east, % counter default xlabel style
        inner sep=+.3333em, /utils/exec=\def\tkz@Xresult{$O$}\fi}}},
  /tkzAxeXY/make an O/.code=, /tkzlabelY/make an O/.code=,
  /tkzdrawX/make an O/.code=, /tkzdrawY/make an O/.code=}
\makeatother
\setlength{\parindent}{0pt}
\usepackage{hyperref}
\hypersetup{
    colorlinks=true,
    linkcolor=black,
    filecolor=purple,      
    urlcolor=RoyalBlue,
    pdfpagemode=FullScreen,
}
\newcommand{\nc}{\newcommand}
\nc{\opta}{\textbf{A) }}
\nc{\optb}{\textbf{B) }}
\nc{\optc}{\textbf{C) }}
\nc{\optd}{\textbf{D) }}
\nc{\boxa}{\boxed{\textbf{A)}}}
\nc{\boxb}{\boxed{\textbf{B)}}}
\nc{\boxc}{\boxed{\textbf{C)}}}
\nc{\boxd}{\boxed{\textbf{D)}}}
\nc{\longdots}{\dots\dots\dots\dots}
\nc{\q}{Question }
\nc{\que}{\textbf{Question: }}
\nc{\ans}{\textbf{Answer: }}
\nc{\nms}{\normalsize}
\nc{\underlinefive}{\underline{\ \ \ \ \ }}
\nc{\underlineten}{\underline{\ \ \ \ \ \ \ \ \ \ }}
\nc{\underlinetwenty}{\underlineten\underlineten}
\nc{\underlinethirty}{\underlinetwenty\underlineten}
\nc{\underlineforty}{\underlinethirty\underlineten}
\nc{\qqquad}{\qquad\quad}
\nc{\qqqquad}{\qquad\qquad}
\usepackage{xcolor}
\usepackage{sectsty}
\sectionfont{\fontsize{18}{15}\selectfont}
\subsectionfont{\fontsize{15}{15}\selectfont}
\subsubsectionfont{\fontsize{13}{15}\selectfont}

\usepackage{titlesec}


\begin{document}

\begin{titlepage}
   \begin{center}
       \vspace*{1cm}

       \Huge
       \textbf{中国高中数学}\\

       \vspace{2cm}
       
       \LARGE
       \textbf{2023 高一上}\\

       \vspace{1cm}

       第1 -- 13课
       
            
   \end{center}
\end{titlepage}

\newpage

\phantom{a} \pagenumbering{gobble}

\newpage

\pagenumbering{roman}
\LARGE
\tableofcontents

\newpage

\phantom{a} \pagenumbering{gobble}

\newpage

\normalsize \pagenumbering{arabic}

\chapter{集合中的常用思想}

\section{元素与集合}

\vspace{1cm}

\subsection{知识点睛}

\vspace{1em}


\end{document}

Could anyone please help me?

Thank you!

Answer 1

You should simplify your code and reduce unnecessary packages, otherwise you will get wrong results.

\documentclass{ctexbook}
\begin{document}
\chapter{test}
\end{document}

Going back to your problem, your problem is that you loaded the sectsty package.

\documentclass{ctexbook}
\usepackage{sectsty}

\begin{document}
\chapter{test}
\end{document}