我对以下示例中的 ToC 编号有疑问：
\documentclass[12pt,english]{report}
\usepackage{setspace}\onehalfspacing
\usepackage{titlesec, blindtext, color}
\usepackage[]{tocbibind}
\usepackage{tocloft}
\renewcommand{\cftdot}{} % remove dots of table of content
\renewcommand{\cfttoctitlefont}{\hfil\bf}
\titleformat{\chapter}[hang]{\centering\normalfont\large\bfseries}{}{0pt}{\large}
\renewcommand\thesection{\arabic{section}}
\setlength{\cftchapnumwidth}{0pt}
\renewcommand\thechapter{}
\titlespacing*{\chapter}{10pt}{0pt}{10pt}
\begin{document}
\pagenumbering{roman}
\addtocontents{toc}{\protect\setlength{\cftbeforechapskip}{-0.5em}}%
\addcontentsline{toc}{chapter}{AUTHOR'S DECLARATION}
\clearpage
\addcontentsline{toc}{chapter}{ABSTRACT}
\include{abstract}
\clearpage
\chapter*{ACKNOWLEDGEMENTS}%
\addcontentsline{toc}{chapter}{ACKNOWLEDGEMENTS}
\clearpage
\tableofcontents
\clearpage
\listoffigures
\addcontentsline{toc}{chapter}{LIST OF ABBRAVIATIONS}
\clearpage
%\addtocontents{toc}{\protect\setlength{\cftbeforechapskip}{1em plus 1pt}}%
\chapter[CHAPTER ONE INTRODUCTION]{CHAPTER ONE\\INTRODUCTION}
\pagenumbering{arabic}
sfsdfsf
sfsdfsf
\section{first section}
This is section one in chapter one.
\section{second section }
This is section two in chapter one.
\chapter[CHAPTER TWO RELATED WORK]{CHAPTER TWO \\RELATED WORD}
\section{first section}
This is section one in chapter TWO.
\section{second section }
This is section two in chapter TWO.
\end{document}