请教各位大佬，如何实现列表环境的横向的各种宽度自动化？

你没理解我的意思

你也没有理解我的意思

@u7483 看看这里：https://tex.stackexchange.com/questions/7008/change-hanging-indent-in-description-list
代码如下：

\documentclass{article}

\usepackage{calc}

\makeatletter
\newcommand{\DESCRIPTION@original@item}{}
\let\DESCRIPTION@original@item\item
\newcommand*{\DESCRIPTION@envir}{DESCRIPTION}
\newlength{\DESCRIPTION@totalleftmargin}
\newlength{\DESCRIPTION@linewidth}
\newcommand{\DESCRIPTION@makelabel}[1]{\llap{#1}}%
\newcommand{\DESCRIPTION@item}[1][]{%
  \setlength{\@totalleftmargin}%
       {\DESCRIPTION@totalleftmargin+\widthof{\textbf{#1 }}-\leftmargin}%
  \setlength{\linewidth}
       {\DESCRIPTION@linewidth-\widthof{\textbf{#1 }}+\leftmargin}%
  \par\parshape \@ne \@totalleftmargin \linewidth
  \DESCRIPTION@original@item[\textbf{#1}]%
}
\newenvironment{DESCRIPTION}
  {\list{}{\setlength{\labelwidth}{0cm}%
           \let\makelabel\DESCRIPTION@makelabel}%
   \setlength{\DESCRIPTION@totalleftmargin}{\@totalleftmargin}%
   \setlength{\DESCRIPTION@linewidth}{\linewidth}%
   \renewcommand{\item}{\ifx\@currenvir\DESCRIPTION@envir
                           \expandafter\DESCRIPTION@item
                        \else
                           \expandafter\DESCRIPTION@original@item
                        \fi}}
  {\endlist}
\makeatother

\begin{document}

\begin{DESCRIPTION}
 \item[Label the first] Lorem ipsum dolor sit amet, consectetur adipisicing
                        elit, sed do eiusmod tempor incididunt ut labore et
                        dolore magna aliqua.
 \item[The longest label] Ut enim ad minim veniam, quis nostrud exercitation
                          ullamco laboris nisi ut aliquip ex ea commodo
                          consequat.
 \item[Shrtlbl] Duis aute irure dolor in reprehenderit in voluptate velit esse
                cillum dolore eu fugiat nulla pariatur.
\end{DESCRIPTION}

\end{document} 

效果图：

@u30 万分感谢，再请教一下，如果是排序列表（enumerate)呢，能类似修改吗？