虽然我的情况可以概括，但如果我描述一个具体的例子也许会更清楚。
我需要将数字作为下标打印在每个段落第一行的左边，但不影响其第一行缩进。
数字与首字母之间的间距必须与脚注数字的默认间距相同。
我一直在尝试定义一个新命令，但无法保持以下文本不变。
以下 MWE 说明了我的意思：
\documentclass[12pt]{book}
\usepackage{fixltx2e}
\newcommand\parnumber[1]{\hspace{-5pt}{\footnotesize}\textsubscript{#1}\kern -2pt\normalsize}
\begin{document}
I should like, before proceeding further, to tell you how I feel...
\parnumber{1} I should like, before proceeding further, to tell you how I feel about the State which we have described. I might compare myself to a person who, on beholding beautiful animals either created by the painter's art, or, better still, alive but at rest, is seized with a desire of seeing them in motion or engaged in some struggle or conflict to which their forms appear suited; this is my feeling about the State which we have been describing.
\parnumber{2} And we too, Socrates, as Timaeus says, will not be wanting in enthusiasm; and there is no excuse for not complying with your request.
\end{document}
第一行显示了段落应如何缩进。第二行显示了\parnumber命令如何影响其缩进。
我知道命令定义充其量只是原始的。
如何才能将其改进为在段落第一个单词之前立即打印数字，而不改变其首行缩进？
我想过使用浮动框，但我无法让它精确地工作。
答案1
在这里，在我的 MWE 中，我使用了\llap，但另一种形式将\makebox[0pt][r]{...}包括\leavevmode\llap{...}
这是经过编辑的 MWE，以将这些更改合并到\parnumber宏本身中。这\ignorespaces允许您在调用后放置空格或不放置空格\parnumber{1}，而不会产生任何不良影响。
\documentclass[12pt]{book}
\usepackage{fixltx2e}
\newcommand\parnumber[1]{\leavevmode\llap{%
\footnotesize\textsubscript{#1}\,}\ignorespaces}
\begin{document}
I should like, before proceeding further, to tell you how I feel...
\parnumber{1}I should like, before proceeding further, to tell you how I feel about the State which we have described. I might compare myself to a person who, on beholding beautiful animals either created by the painter's art, or, better still, alive but at rest, is seized with a desire of seeing them in motion or engaged in some struggle or conflict to which their forms appear suited; this is my feeling about the State which we have been describing.
\parnumber{2} And we too, Socrates, as Timaeus says, will not be wanting in enthusiasm; and there is no excuse for not complying with your request.
\end{document}
