\documentclass[12pt]{book}\usepackage{xeCJK}\usepackage{fontspec}\newfontfamily\sourcehansans{Source Han Sans CN}\newfontfamily\sourcehanserif{Source Han Serif CN}\setCJKmainfont{Source Han Serif CN}\setCJKsansfont{Source Han Sans CN}\usepackage{geometry}\geometry {  paperheight=297mm,paperwidth=210mm,left=9mm, right=9mm, top=7mm, bottom=7mm}\usepackage[table]{xcolor}\usepackage{supertabular}\usepackage{tabularx}\usepackage{booktabs}\newcolumntype{L}[2]{>{\sf \columncolor{#1} \raggedright \arraybackslash} m{#2}}  \begin{document}\begin{center}    \tablefirsthead{        \hline        \multicolumn{
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    1}{|c}{Item} &        \multicolumn{
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