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\begin{document}
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    \begin{abstract}
        \zihao{-4}
        An abstract is a brief summary of a research article, thesis, review, conference proceeding, or any in-depth analysis of a particular subject and is often used to help the reader quickly ascertain the paper's purpose. An abstract is a brief summary of a research article, thesis, review, conference proceeding, or any in-depth analysis of a particular subject and is often used to help the reader quickly ascertain the paper's purpose. \\
        \textbf{Keywords: keyword1 --- keyword2 --- keyword3}
    \end{abstract}
    \section{Introduction}
    
    An abstract is a brief summary of a research article, thesis, review, conference proceeding, or any in-depth analysis of a particular subject and is often used to help the reader quickly ascertain the paper's purpose \cite{2022NewAR..9501659P}.
    \section{Methods}
    An abstract is a brief summary of a research article, thesis, review, conference proceeding, or any in-depth analysis of a particular subject and is often used to help the reader quickly ascertain the paper's purpose.
    \begin{align}
        h^\mathrm{TT}_{\mu\nu}(t,z) = 
        \begin{pmatrix}
          0 & 0 & 0 & 0 \\
          0 & h_+ & h_\times & 0 \\
          0 & h_\times & -h_+ & 0 \\
          0 & 0 & 0 & 0 
        \end{pmatrix}
        \cos\left[\omega(t-z)\right],
        \label{eqn:h}
    \end{align}
    Equation (\ref{eqn:h}) shows how to reference a equation. An abstract is a brief summary of a research article, thesis, review, conference proceeding, or any in-depth analysis of a particular subject and is often used to help the reader quickly ascertain the paper's purpose.
    \section{Results}
    An abstract is a brief summary of a research article, thesis, review, conference proceeding, or any in-depth analysis of a particular subject and is often used to help the reader quickly ascertain the paper's purpose.
    \subsection{Result \#1}
    An abstract is a brief summary of a research article, thesis, review, conference proceeding, or any in-depth analysis of a particular subject and is often used to help the reader quickly ascertain the paper's purpose.
    \begin{figure}[htbp]
        \centering
        \includegraphics[width=0.8\textwidth]{figures/plot.pdf}
        \caption{Left panel: $V=0,~Q<0,~U=0$, i.e., \emph{$\pi/2$ linear} polarization, right panel: $V=0,~Q=0,~U<0$, i.e., \emph{$3\pi/4$ linear} polarization.}\label{fig:pl}
    \end{figure}
    Figure \ref{fig:pl} shows how to add a figure caption and reference a figure. An abstract is a brief summary of a research article, thesis, review, conference proceeding, or any in-depth analysis of a particular subject and is often used to help the reader quickly ascertain the paper's purpose.
    \subsection{Result \#2}
    An abstract is a brief summary of a research article, thesis, review, conference proceeding, or any in-depth analysis of a particular subject and is often used to help the reader quickly ascertain the paper's purpose.
    An abstract is a brief summary of a research article, thesis, review, conference proceeding, or any in-depth analysis of a particular subject and is often used to help the reader quickly ascertain the paper's purpose.
   \begin{table}[htbp]
        \zihao{5}
        \caption{2022 Winter Olympics medal table}
        \label{tab:data}
        \centering
        \begin{tabular}{ccrrrr}
            \toprule
            Rank & NOC & Gold & Silver & Bronze & Total \\ 
            \midrule
            1 & Norway & 16 & 8 & 13 & 37 \\
            2 & Germany & 12 & 10 & 5 & 27 \\
            3 & China & 9 & 4 & 2 & 15 \\
            \bottomrule
        \end{tabular}
    \end{table}
    Table \ref{tab:data} shows how to add a table caption and reference a table. An abstract is a brief summary of a research article, thesis, review, conference proceeding, or any in-depth analysis of a particular subject and is often used to help the reader quickly ascertain the paper's purpose.
    \section{Discussions}
    An abstract is a brief summary of a research article, thesis, review, conference proceeding, or any in-depth analysis of a particular subject and is often used to help the reader quickly ascertain the paper's purpose.
    An abstract is a brief summary of a research article, thesis, review, conference proceeding, or any in-depth analysis of a particular subject and is often used to help the reader quickly ascertain the paper's purpose.
    \section{Conclusion}
    An abstract is a brief summary of a research article, thesis, review, conference proceeding, or any in-depth analysis of a particular subject and is often used to help the reader quickly ascertain the paper's purpose.
    \begin{acknowledgements}
        This work is supported by the ...
    \end{acknowledgements}
    
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