两端对齐但不缩进

Question 1

最好使用帕斯基普包（如问题中所示）而不是仅仅调整parskip和parindent自己，除非您还准备进行必要的调整以避免这些变化的副作用。

除了调整这些长度之外，parskip还进行了一些基本工作以避免列表环境中的间距过大。即使您认为自己不使用列表，但您可能确实使用了列表，因为许多 LaTeX 环境都是基于列表的。例如，quotation是一个普通的列表环境，还有许多其他列表环境。

这是一份仅根据以下情况手动调整长度的文档Fran 的回答：

\documentclass{article}
\usepackage{lipsum} % for example dummy text
\setlength\parskip{.5\baselineskip plus .1\baselineskip minus .1\baselineskip}
\setlength\parindent{0pt}
\begin{document}
  \lipsum[1]

  \begin{quotation}
    \lipsum[2]
  \end{quotation}

  \lipsum[3]

  \begin{itemize}
    \item This is the first item in a list of several items, which is preceded by none but followed by some.
    \item This is the second item in a list of several items, which is preceded by some and followed by some.
    \item This is the third item in a list of several items, which is preceded by some and followed by some.
    \item This is the fourth item in a list of several items, which is preceded by some but followed by none.
  \end{itemize}

  \lipsum[4]
\end{document}

列表间距过大

可以看出，与常规段落之间的间距相比，引文和列表周围的间距过多。

parskip以下是使用默认调整的同一文档：

\documentclass{article}
\usepackage{lipsum} % for example dummy text
\usepackage[parfill]{parskip}
\begin{document}
  \lipsum[1]

  \begin{quotation}
    \lipsum[2]
  \end{quotation}

  \lipsum[3]

  \begin{itemize}
    \item This is the first item in a list of several items, which is preceded by none but followed by some.
    \item This is the second item in a list of several items, which is preceded by some and followed by some.
    \item This is the third item in a list of several items, which is preceded by some and followed by some.
    \item This is the fourth item in a list of several items, which is preceded by some but followed by none.
  \end{itemize}

  \lipsum[4]
\end{document}

使用 <code>parskip</code> 进行默认调整

仍然很有可能调整，parskip同时受益于包改进的列表环境布局。此示例使用parskip与第一个文档中相同的内容，并按照 Fran 的“合理”设置指定：

\documentclass{article}
\usepackage{lipsum} % for example dummy text
\usepackage[parfill]{parskip}
\setlength\parskip{.5\baselineskip plus .1\baselineskip minus .1\baselineskip}
\begin{document}
  \lipsum[1]

  \begin{quotation}
    \lipsum[2]
  \end{quotation}

  \lipsum[3]

  \begin{itemize}
    \item This is the first item in a list of several items, which is preceded by none but followed by some.
    \item This is the second item in a list of several items, which is preceded by some and followed by some.
    \item This is the third item in a list of several items, which is preceded by some and followed by some.
    \item This is the fourth item in a list of several items, which is preceded by some but followed by none.
  \end{itemize}

  \lipsum[4]
\end{document}

<code>parskip</code> 包，带有手动设置 <code>parskip</code> 长度

可以看出，手动调整长度parskip不会破坏通过加载包实现的布局增强parskip。因此，此选项可为标准类提供最佳效果。

也就是说，有些类在设计时就考虑到了非零parskip和零parindent，因此这些类可能会有更细粒度的调整。但对于没有这样设计的类，加载包parskip而不是明确设置长度或除了parskip明确设置长度之外，将获得最佳结果。

为了避免引用中缩进段落的奇怪现象，请使用而quote不是，quotation或者让后一个环境等于前一个环境：

\documentclass{article}
\usepackage{lipsum} % for example dummy text
\usepackage[parfill]{parskip}
\setlength\parskip{.5\baselineskip plus .1\baselineskip minus .1\baselineskip}
\let\quotation\quote
\begin{document}
  \lipsum[1]

  \begin{quotation}
    \lipsum[2]
  \end{quotation}

  \lipsum[3]

  \begin{itemize}
    \item This is the first item in a list of several items, which is preceded by none but followed by some.
    \item This is the second item in a list of several items, which is preceded by some and followed by some.
    \item This is the third item in a list of several items, which is preceded by some and followed by some.
    \item This is the fourth item in a list of several items, which is preceded by some but followed by none.
  \end{itemize}

  \lipsum[4]
\end{document}

<code>parskip</code>，调整了<code>parskip</code>并修复了<code>quotation</code>

Answer