表格的格式问题，没有公式时可以正常使用，加入公式后出现! Package array Error: Illegal pream-token (x): `。求教是哪里出现问题。
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\begin{document}
\begin{table*}
\caption{Parameter values of BS model}
\begin{tabularx}{\textwidth}{@{} llx@{}}
\toprule
Variable & Value & Explanation\\
\midrule
\multirow{2}{*}{$S_0$} &\$5.3761m & Discounted value of net cash flow in the first year.\\
&\$35.5995m & The sum of the present value of the total net cash flow during the economic life of the entire equipment.\\
K &\$6.46m &The execution price is expressed by the initial investment amount of the desulfurization equipment.\\
$\sigma$ &31.44\% &The volatility of fuel price.\\
Discount rate &11\% &Discount rate is weighted average capital cost (WACC).\\
T &15y &Economic Life of Desulfurization Equipment.\\
$\Delta t$ &1y &Interval time\\
\bottomrule
\end{tabularx}
\end{table*}
\end{document}
