我一直收到上述错误，有人能看出错误是什么吗？谢谢。
\begin{table*}[h]
\caption{Categorical Review}
\begin{adjustbox}{max width=\textwidth}
\begin{tabular}{|m{4cm}|m{1.5cm}|m{1.5cm}|m{1.5cm}|m{2cm}|m{2.7cm}|m{4cm}|} \hline
\centering \textbf {\normalsize Paper } & \centering \textbf {\normalsize Type} & \centering \textbf {\normalsize Defined Twin} & \centering \textbf {\normalsize Actual Twin} & \centering \textbf {\normalsize Broad Area} & \centering \textbf {\normalsize Specific Area} & \centering \textbf {\normalsize Technology} & \hline
{\small Bilberg, Malik (2019) \cite{bilberg_digital_2019} } & {\small Case Study} & { \small DT} & {\small DS} & {\small Manufacturing} & { \small Smart Factory} & {\small Simulation } \\[0.3cm] \hline
{\small Chhetri et al. (2019) \cite{chhetri_quilt:_2019} } & {\small Case Study} & { \small DT} & {\small DT } & {\small Manufacturing} & { \small Assembly Line} & {\small AI, Sensors, Simulation } \\[0.3cm]
\hline
{\small He et al. (2018) \cite{he_surveillance_2018} } & {\small Review } & { \small DT} & {\small DS } & {\small Manufacturing} & { \small Power System } & {\small Simulation, AI, Analytics } \\[0.3cm]
\hline
{\small Howard (2019) \cite{howard_digital_2019} } & {\small Concept } & { \small DT} & {\small DM } & {\small Manufacturing } & { \small Product Development } & {\small EDA, Visualisation } \\[0.3cm]
\hline
{\small Jain et al. (2019) \cite{jain_digital_2019} } & {\small Concept } & { \small DT} & {\small DT } & {\small Manufacturing } & { \small Fault Diagnosis} & {\small Industry 4.0 } \\[0.3cm]
\hline
{\small Karadeniz et al. (2019) \cite{karadeniz_digital_2019} } & {\small Case Study } & { \small DT} & {\small DS } & {\small Manufacturing } & { \small Ice Cream Machines} & {\small AR, VR, Industry 4.0, AI, CPS } \\[0.3cm]
\hline
{\small Kuehn (2019) \cite{kuehn_simulation_2019} } & {\small Concept } & { \small DT} & {\small DS } & {\small Manufacturing } & { \small Smart Factory } & {\small Simulation } \\[0.3cm]
\hline
{\small Lu (2019) ( \cite{lu_energy-efficient_2019} } & {\small Review } & { \small DT} & {\small No Example} & {\small Manufacturing} & { \small Smart factory} & {\small Cloud, CPS, Industry 4.0 } \\[0.5cm]
\hline
{\small Mandolla et al. (2019) \cite{mandolla_building_2019} } & {\small Case Study } & { \small DT} & {\small No Example } & {\small Manufacturing } & { \small Aircraft} & {\small Blockchain, Visualisation } \\[0.5cm]
\hline
{\small Mawson, Hughes (2019) \cite{mawson_development_2019} } & {\small Case Study } & { \small DT} & {\small DT } & {\small Manufacturing } & { \small Energy Modelling} & {\small Industry 4.0 }\\[0.3cm]
\hline
{\small Min et al. (2019) \cite{min_machine_2019} } & {\small Case Study } & { \small DT} & {\small DS } & {\small Manufacturing } & { \small Petrochemical Factory } & {\small AI, Optimisation }\\[0.3cm]
\hline
{\small Qi, Tao (2018) \cite{qi_digital_2018} } & {\small Review } & { \small DT} & {\small DT } & {\small Manufacturing } & { \small Smart Factory} & {\small Industry 4.0 , AI, Cloud, Big data } \\[0.3cm]
\hline
{\small Shangguan et al. (2019) \cite{shangguan_hierarchical_2019} } & {\small Case Study } & { \small DT} & {\small DM } & {\small Manufacturing } & { \small Wind Turbine} & {\small CPS, } \\[0.3cm]
\hline
{\small Sivalingam et al. (2018) \cite{sivalingam_review_2018} } & {\small Review } & { \small DT} & {\small DS} & {\small Manufacturing} & { \small Wind Turbine } & {\small CPS, Simulation } \\[0.3cm]
\hline
{\small Tao et al. (2019) \cite{tao_digital_2019} } & {\small Review } & { \small DT} & {\small DT } & {\small Manufacturing } & { \small Smart Factory} & {\small CPS, Industry 4.0, AI } \\[0.4cm]
\hline
{\small Tao et al. (2018) \cite{tao_digital_2018} } & {\small Review } & { \small DT} & {\small DT } & {\small Manufacturing } & { \small Assembly Line} & {\small CPS, Industry 4.0, AI } \\[0.4cm]
\hline
{\small Xu et al. (2018) \cite{xu_digital-twin-assisted_2019} } & {\small Concept } & { \small DT} & {\small DS} & {\small Manufacturing} & { \small Fault Diagnosis} & {\small CPS, Industry 4.0, AI, Transfer Learning } \\[0.4cm]
\hline
{\small El Saddik (2018) \cite{el_saddik_digital_2018} } & {\small Definition } & { \small DT} & {\small DT } & {\small Healthcare } & { \small Patient Monitoring} & {\small VR, AI } \\[0.4cm]
\hline
{\small Laaki et al. (2019) \cite{laaki_prototyping_2019} } & {\small Concept } & { \small Undefined} & {\small DS } & {\small Healthcare } & { \small Surgery Robotics} & {\small Industry 4.0,AI ,VR } \\[0.4cm]
\hline
{\small Liu et al (2019) \cite{liu_novel_2019} } & {\small Concept } & { \small DT} & {\small DT} & {\small Healthcare} & { \small Health Management, Elderly Health} & {\small Cloud, CPS }\\[0.4cm]
\hline
{\small Ross (2016) \cite{ross_digital_2016} } & {\small Review } & { \small DT} & {\small DT} & {\small Healthcare} & { \small Predictive Health \& Well-being} & {\small VR, 3D Modeling } \\[0.4cm]
\hline
{\small Chen et al. (2018) \cite{chen_digital_2018} } & {\small Review} & { \small Undefined} & {\small DS } & {\small Smart City } & { \small Driving} & {\small Simulation, AI } \\[0.4cm]
\hline
{\small Jo (2018) \cite{jo_smart_2018} } & {\small Review } & { \small DT} & {\small DT } & {\small Smart City } & { \small Livestock Farms } & {\small Industry 4.0 } \\[0.4cm]
\hline
{\small Mohammadi, Taylor (2017) \cite{mohammadi_smart_2017} } & {\small Concept } & { \small DT} & {\small DT} & {\small Smart City} & { \small Infrastructure Analysis} & {\small Simulation, VR } \\[0.4cm]
\hline
{\small Pargmann et al. (2018) \cite{pargmann_intelligent_2018} } & {\small Review } & { \small DT} & {\small DS } & {\small Smart City} & { \small Wind Farm } & {\small AR ,AI , Cloud } \\[0.4cm]
\hline
{\small Ruohomäki et al. (2018) \cite{ruohomaki_smart_2018} } & {\small Case Study } & { \small DT} & {\small DS} & {\small Smart City} & { \small 3D Energy Mapping} & {\small Visualisation, Sensors Ontology} \\[0.4cm]
\hline
\end{tabular}
\end{adjustbox}
%\vspace*{1mm}
\end{table*}
答案1
环境tabular设置为 7 列。但是，标题行包含一个错误：和&之间的符号。{\normalsize Technology}\hline
\centering \textbf {\normalsize Paper } & \centering \textbf {\normalsize Type} &
\centering \textbf {\normalsize Defined Twin} & \centering \textbf {\normalsize
Actual Twin} & \centering \textbf {\normalsize Broad Area} & \centering \textbf
{\normalsize Specific Area} & \centering \textbf {\normalsize Technology} & \hline
&如果您用替换该实例\\，并且还将字符串替换\centering \textbf {\normalsize Technology}为\centering\arraybackslash \textbf {\normalsize Technology}，那么您的代码就应该可以编译。
我认为可以公平地说，虽然代码可以编译，但从美学角度来看，生成的表格并不特别有吸引力。特别是，虽然 的存在\begin{adjustbox}{max width=\textwidth}确保了表格可以适合文本块的宽度，但几乎确保了使用极小的字体，因此很难阅读您写的内容。
因此，我建议您使用环境tabularx，使用不同的列宽，并删除所有垂直线和大多数水平线。综合起来，这些措施将使材料具有更吸引人和更易于阅读的“外观”。哦，不要用\small指令淹没几乎每个单元格，只需提供一个\small指令即可开始环境table。
\documentclass[twocolumn]{article} % or some other suitable document class
\usepackage[letterpaper,margin=1in]{geometry} % set page size parameters suitably
\usepackage{tabularx,ragged2e,booktabs}
\newcolumntype{L}{>{\RaggedRight\arraybackslash\hspace{0pt}}X}
\newcolumntype{P}[1]{>{\RaggedRight\hspace{0pt}}p{#1}}
\newlength\lena\settowidth\lena{\small Defined} % col. 3
\newlength\lenb\settowidth\lenb{\small No Ex.} % col. 4
\begin{document}
\begin{table*}
\setlength\tabcolsep{3pt} % default: 6pt
\small % <-- a single '\small' directive suffices
\caption{Categorical Review}
\smallskip
\begin{tabularx}{\textwidth}{@{} P{3cm} l P{\lena} P{\lenb} l *{2}{L} @{}}
\toprule
Paper & Type & Defined Twin & Actual Twin & Broad Area & Specific Area & Technology \\
\midrule
Bilberg, Malik (2019) \cite{bilberg_digital_2019} & Case Study & DT & DS & Manufacturing & Smart Factory & Simulation \\
Chhetri et al. (2019) \cite{chhetri_quilt:_2019} & Case Study & DT & DT & Manufacturing & Assembly Line & AI, Sensors, Simulation \\
He et al. (2018) \cite{he_surveillance_2018} & Review & DT & DS & Manufacturing & Power System & Simulation, AI, Analytics \\
Howard (2019) \cite{howard_digital_2019} & Concept & DT & DM & Manufacturing & Product Development & EDA, Visualisation \\
Jain et al. (2019) \cite{jain_digital_2019} & Concept & DT & DT & Manufacturing & Fault Diagnosis & Industry 4.0 \\
Karadeniz et al. (2019) \cite{karadeniz_digital_2019} & Case Study & DT & DS & Manufacturing & Ice Cream Machines & AR, VR, Industry 4.0, AI, CPS \\
Kuehn (2019) \cite{kuehn_simulation_2019} & Concept & DT & DS & Manufacturing & Smart Factory & Simulation \\
Lu (2019) ( \cite{lu_energy-efficient_2019} & Review & DT & No Ex. & Manufacturing & Smart factory & Cloud, CPS, Industry 4.0 \\
Mandolla et al. (2019) \cite{mandolla_building_2019} & Case Study & DT & No Ex. & Manufacturing & Aircraft & Blockchain, Visualisation \\
Mawson, Hughes (2019) \cite{mawson_development_2019} & Case Study & DT & DT & Manufacturing & Energy Modelling & Industry 4.0 \\
Min et al. (2019) \cite{min_machine_2019} & Case Study & DT & DS & Manufacturing & Petrochemical Factory & AI, Optimisation \\
Qi, Tao (2018) \cite{qi_digital_2018} & Review & DT & DT & Manufacturing & Smart Factory & Industry 4.0 , AI, Cloud, Big data \\
Shangguan et al. (2019) \cite{shangguan_hierarchical_2019} & Case Study & DT & DM & Manufacturing & Wind Turbine & CPS, \\
Sivalingam et al. (2018) \cite{sivalingam_review_2018} & Review & DT & DS & Manufacturing & Wind Turbine & CPS, Simulation \\
Tao et al. (2019) \cite{tao_digital_2019} & Review & DT & DT & Manufacturing & Smart Factory & CPS, Industry 4.0, AI \\
Tao et al. (2018) \cite{tao_digital_2018} & Review & DT & DT & Manufacturing & Assembly Line & CPS, Industry 4.0, AI \\
Xu et al. (2018) \cite{xu_digital-twin-assisted_2019} & Concept & DT & DS & Manufacturing & Fault Diagnosis & CPS, Industry 4.0, AI, Transfer Learning \\
\addlinespace
El Saddik (2018) \cite{el_saddik_digital_2018} & Definition & DT & DT & Healthcare & Patient Monitoring & VR, AI \\
Laaki et al. (2019) \cite{laaki_prototyping_2019} & Concept & Undef. & DS & Healthcare & Surgery Robotics & Industry 4.0,AI ,VR \\
Liu et al (2019) \cite{liu_novel_2019} & Concept & DT & DT & Healthcare & Health Management, Elderly Health & Cloud, CPS \\
Ross (2016) \cite{ross_digital_2016} & Review & DT & DT & Healthcare & Predictive Health \& Well-being & VR, 3D Modeling \\
\addlinespace
Chen et al. (2018) \cite{chen_digital_2018} & Review & Undef. & DS & Smart City & Driving & Simulation, AI \\
Jo (2018) \cite{jo_smart_2018} & Review & DT & DT & Smart City & Livestock Farms & Industry 4.0 \\
Mohammadi, Taylor (2017) \cite{mohammadi_smart_2017} & Concept & DT & DT & Smart City & Infrastructure Analysis & Simulation, VR \\
Pargmann et al. (2018) \cite{pargmann_intelligent_2018} & Review & DT & DS & Smart City & Wind Farm & AR, AI, Cloud \\
Ruohomäki et al. (2018) \cite{ruohomaki_smart_2018} & Case Study & DT & DS & Smart City & 3D Energy Mapping & Visualisation, Sensors Ontology \\
\bottomrule
\end{tabularx}
\end{table*}
\end{document}