xelatex 中 expex 中 \textenglish{} 和 \begin{english} ... \end{english} 之间的区别

Question

考虑两个 LaTeX 文件。

第一个（test1.tex）：

\documentclass[12pt]{article}

% extra packages
\usepackage[margin=0.5in]{geometry}
\usepackage{expex}
\usepackage{polyglossia}
\usepackage{setspace}

% dimensions
\newlength{\defparindent}
\setlength{\defparindent}{\parindent}
\setlength{\parindent}{0pt}

% custom ling styles
\definelingstyle{Text}{aboveexskip=0pt,belowexskip=0pt,
  belowglpreambleskip=0pt,aboveglftskip=0pt,glwordalign=center,
  glftpos=right,glhangstyle=none,ssratio=.60,
  everygla=\arabicfont\Large,everyglb=\englishfont\normalsize,
  everyglft=\englishfont\normalsize}

% font
\newfontfamily\arabicfont[Script=Arabic]{Scheherazade}
\newfontfamily\englishfont{Linux Libertine Display O}


\pagestyle{empty}

\setmainlanguage{english}
\setotherlanguage{arabic}

\begin{document}

\onehalfspacing
\exdisplay[lingstyle=Text]
\begin{Arabic}
\begingl
\gla
عائِلَةُ مازِن نَجّار
//
\glb
\textenglish{nuclear family} Mazen Najjar
//
\glft
\textenglish{Mazen Najjar's Family}
//
\endgl
\end{Arabic}

\end{document}

第二个（test2.tex）：

\documentclass[12pt]{article}

% extra packages
\usepackage[margin=0.5in]{geometry}
\usepackage{expex}
\usepackage{polyglossia}
\usepackage{setspace}

% dimensions
\newlength{\defparindent}
\setlength{\defparindent}{\parindent}
\setlength{\parindent}{0pt}

% custom ling styles
\definelingstyle{Text}{aboveexskip=0pt,belowexskip=0pt,
  belowglpreambleskip=0pt,aboveglftskip=0pt,glwordalign=center,
  glftpos=right,glhangstyle=none,ssratio=.60,
  everygla=\arabicfont\Large,everyglb=\englishfont\normalsize,
  everyglft=\englishfont\normalsize}

% font
\newfontfamily\arabicfont[Script=Arabic]{Scheherazade}
\newfontfamily\englishfont{Linux Libertine Display O}


\pagestyle{empty}

\setmainlanguage{english}
\setotherlanguage{arabic}

\begin{document}

\onehalfspacing
\exdisplay[lingstyle=Text]
\begin{Arabic}
\begingl
\gla
عائِلَةُ مازِن نَجّار
//
\glb
\textenglish{nuclear family} Mazen Najjar
//
\glft
\begin{english}
Mazen Najjar's Family
\end{english}
//
\endgl
\end{Arabic}

\end{document}

使用 GNU diff 查看差异：

  $ diff -u test1.tex test2.tex
--- test1.tex   2017-03-11 23:55:32.914015840 -0600
+++ test2.tex   2017-03-11 23:55:37.630039225 -0600
@@ -41,7 +41,9 @@
 \textenglish{nuclear family} Mazen Najjar
 //
 \glft
-\textenglish{Mazen Najjar's Family}
+\begin{english}
+Mazen Najjar's Family
+\end{english}
 //
 \endgl
 \end{Arabic}

两个文件的输出不同。为什么？

test1.tex 的输出：

test2.tex 的输出：

Answer 1

为了在 test1.tex 中得到你想要的东西，只需添加\raggedleft到 下的自定义 lingstyle即可everyglft。

% custom ling styles
\definelingstyle{Text}{aboveexskip=0pt,belowexskip=0pt,
  belowglpreambleskip=0pt,aboveglftskip=0pt,glwordalign=center,
  glftpos=right,glhangstyle=none,ssratio=.60,
  everygla=\arabicfont\Large,everyglb=\englishfont\normalsize,
  everyglft=\englishfont\normalsize\raggedleft}