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\documentclass{xxxx}

\begin{document}
    \maketitle

    \begin{abstracten}
    \end{abstracten}

    \begin{abstractzh}
    \end{abstractzh}

    \toc

    \chapter{MAIN BODY}
    \section{Figures}
    \subsection{Example A}
    \section{Tables}
    \subsection{Example A}
    \section{Equations}
    \subsection{Example A}
    \subsection{Example B}
    \section{Citation}
    \subsection{Example A}
    \reference{reference}

    \chapter{MAIN BODY}
    \section{Figures}
    \subsection{Example A}
    \section{Tables}
    \subsection{Example A}
    \section{Equations}
    \subsection{Example A}
    \subsection{Example B}
    \section{Citation}
    \subsection{Example A}
    \reference{reference}

    \chapter{MAIN BODY}
    \section{Figures}
    \subsection{Example A}
    \section{Tables}
    \subsection{Example A}
    \section{Equations}
    \subsection{Example A}
    \subsection{Example B}
    \section{Citation}
    \subsection{Example A}
    \reference{reference}

    \chapter{MAIN BODY}
    \section{Figures}
    \subsection{Example A}
    \section{Tables}
    \subsection{Example A}
    \section{Equations}
    \subsection{Example A}
    \subsection{Example B}
    \section{Citation}
    \subsection{Example A}
    \reference{reference}

    \chapter{MAIN BODY}
    \section{Figures}
    \subsection{Example A}
    \section{Tables}
    \subsection{Example A}
    \section{Equations}
    \subsection{Example A}
    \subsection{Example B}
    \section{Citation}
    \subsection{Example A}
    \reference{reference}

    \appendix
    \section{Appendix A}
    \section{Appendix B}
    \section{Appendix C}

    \acknowledgements
\end{document}