When writing a paper in LaTex, I was troubled by a table for a long time, but finally found a solution, the code is here for future inquiries:
\begin{
table}[h]
\caption{
符号说明}
\centering
\begin{
tabular}{
p{
3cm}<{
\centering} p{
7cm}<{
\centering} p{
3cm}<{
\centering} }
\toprule
{
\heiti 符号} & {
\heiti 意义}& {
\heiti 单位}\\
\hline
Format & Extension& Description\\
Format & Extension& Description\\
Format & Extension& Description\\
\bottomrule
\end{
tabular}
\end{
table}