\linebreak 使前一行的单词扩展

Question 1

您不应将其\linebreak用于段落。它仅设置绝对断点，因此该行的对齐方式与对齐段落的其他行一样。

您也不应该将\newline或\\用于段落。\par源代码中的正确段落是或空行：

\documentclass[a5paper,openany,14pt,oneside,]{extbook}
\usepackage[left=2.34cm, right=2.34cm, top=2.66cm]{geometry}
\begin{document}
\chapter{Wine refrigerator}
Wine refrigerator is our newest product on the line. Refrigerated air flows around the bottles to make the wine cool on every side. The thermometer reading must be regularly checked. The temperature is 15 degrees.

The refrigerator must be installed in a cool dry place.
\end{document}

a5paper顺便说一句：14pt在对齐文本方面有点问题。（请参见示例中带有“The”的溢出 \hbox。）但你可以改进它，使用包裹microtype：

\documentclass[a5paper,openany,14pt,oneside,]{extbook}
\usepackage[left=2.34cm, right=2.34cm, top=2.66cm]{geometry}
\usepackage{microtype}
\begin{document}
\chapter{Wine refrigerator}
Wine refrigerator is our newest product on the line. Refrigerated air flows around the bottles to make the wine cool on every side. The thermometer reading must be regularly checked. The temperature is 15 degrees.
\par
The refrigerator must be installed in a cool dry place.
\end{document}

编辑，因为问题中的 MWE 发生了变化（在已经回答了原始问题之后！）。

如果你不使用\chapter，使用extbook和选项openany就没有多大意义。在这种情况下，这extarticle勉强够用。所以我在以下答案中使用了这个类。

对于标准类或类似 ext-classes 的派生类，使用段落距离（跳过）而不是缩进段落第一行的最佳选择是parskip包裹。我认为将常规段落跳过设置与一些仅缩进的段落混合在一起也没有多大意义，也不是好的风格。但是，您可以简单地使用缩进段落的环境来做到这一点：

\documentclass[a5paper,14pt]{extarticle}
\usepackage[left=2.34cm, right=2.34cm, top=2.66cm]{geometry}
\usepackage[skip=6pt plus 2pt minus 1pt]{parskip}% To use paragraph skip
                                                 % instead of indent.
\usepackage{microtype}
\newenvironment{indentedpar}{%
  \par
  \setlength{\parfillskip}{0pt plus 1fil}%
  \setlength{\parindent}{1em}%
  \setlength{\parskip}{0pt}%
}{%
  \par
}

\begin{document}

Wine refrigerator is our newest product on the line. Refrigerated air flows around the bottles to make the wine cool on every side. The thermometer reading must be regularly checked. The temperature is 15 degrees.
\begin{indentedpar}
  The refrigerator must be installed in a cool dry place.
\end{indentedpar}
\end{document}

但有时确实有意义，使用段落缩进作为默认设置，并有一种无标题的部分但距离。在这种情况下，定义一个特殊的段落命令将是一个好主意：

\documentclass[a5paper,14pt]{extarticle}
\usepackage[left=2.34cm, right=2.34cm, top=2.66cm]{geometry}

\usepackage{microtype}
\newcommand*{\microsection}{\par\medskip\noindent}% Alternatively you can use \smallskip or \bigskip or a \vspace{…}

\usepackage{lipsum}% useful for MWEs

\begin{document}

\lipsum[1]
\microsection
Wine refrigerator is our newest product on the line. Refrigerated air flows around the bottles to make the wine cool on every side. The thermometer reading must be regularly checked. The temperature is 15 degrees.

The refrigerator must be installed in a cool dry place.
\end{document}

Answer