将表格置于单元格边界的中心吗？

Question

我有下表：

\documentclass[ebook]{memoir}
\begin{document}
\begin{center}
\begin{tabular}{rl}
First edition: & 2014 \\
Second edition: & 2015 \\
Third edition: & 2017 \\
\end{tabular}

1 2 3 4 5 6 7 8 9 0 9 8 7 6 5 4 3 2 1

center
\end{center}
\end{document}

我希望表格以 & 为中心，而不是以表格宽度为中心。从技术上讲，它会偏离中心，但视觉上看起来更好（空白处将位于 0 上方）。

有没有一种简单的方法可以做到这一点，而无需缩小页面并手动调整？

Answer 1

eqparbox将\eqmakebox[<tag>][<align>]{<stuff>}所有的集合<stuff>放在<tag>相同宽度的盒子中。此外，您可以指定<align>适合您需求的选项：

\documentclass{article}

\usepackage{eqparbox}

\begin{document}

\begin{center}
  \begin{tabular}{ r | l }
    First edition: & 2014 \\
    \eqmakebox[widest][r]{Second edition:} & \eqmakebox[widest][l]{2015} \\
    Third edition: & 2017
  \end{tabular}

  1 2 3 4 5 6 7 8 9 0 9 8 7 6 5 4 3 2 1
\end{center}

\end{document}

由于此过程使用文件，因此每次更改（框的宽度）时都.aux需要至少两次编译。<stuff>

Answer 2

像这样？

    \documentclass[ebook]{memoir}
    \begin{document}
    \begin{tabularx}{0.8\linewidth}{>{\raggedleft}XX}
    First edition:  & 2014 \\
    Second edition: & 2015 \\
    Third edition:  & 2017 \\
    \multicolumn{2}{c}{1 2 3 4 5 6 7 8 9 0 9 8 7 6 5 4 3 2 1}\\
    \multicolumn{2}{c}{center}
    \end{tabularx}

    \end{document}

**Edit:**
Ups! At upload of codes I by mistake load the same code twice. The second one should be as in now the code above. With comparison of result of Werner and my solution I don't see any difference (above is Werner solution, below is my):

\documentclass{memoir}
\usepackage{eqparbox}

\usepackage{showframe}

\begin{document}
\begin{center}
  \begin{tabular}{ r | l }
    First edition: & 2014 \\
    \eqmakebox[widest][r]{Second edition:} & \eqmakebox[widest][l]{2015} \\
    Third edition: & 2017
  \end{tabular}

  1 2 3 4 5 6 7 8 9 0 9 8 7 6 5 4 3 2 1

\begin{tabularx}{.8\linewidth}{>{\raggedleft}XX}
First edition:  & 2014 \\
Second edition: & 2015 \\
Third edition:  & 2017 \\
\end{tabularx}
\end{center}

\end{document}[![enter image description here][2]][2]