输入数字时长行不会换行

Question

为什么下面的长行不会换行以及如何强制换行？

\documentclass[a4paper]{article}
\usepackage{polyglossia}
\setmainlanguage{english}
\setotherlanguage{arabic}

\newfontfamily\arabicfont[Script=Arabic, Scale=1]{Tahoma}

\begin{document}
This is a very long line that normally needs to be wrapped:
\\
\textarabic{\char64474\char64475\char64474\char64475\char64474\char64475\char64474\char64475\char64474\char64475\char64474\char64475\char64474\char64475\char64474\char64475\char64474\char64475\char64474\char64475\char64474\char64475\char64474\char64475\char64380\char64381\char64380\char64381\char64380\char64381\char64380\char64381\char64380\char64381\char64380\char64381\char64380\char64381\char64380\char64381\char64380\char64381\char64380\char64381\char64380\char64381\char64380\char64381\char64380\char64381\char64380\char64381\char64380\char64381\char64380\char64381\char64380\char64381\char64380\char64381\char64380\char64381\char64380\char64381\char64380\char64381\char64380\char64381\char64380\char64381\char64380\char64381\char64380\char64381\char64380\char64381\char64380\char64381\char64380\char64381\char64380\char64381}

Same thing with a space filled character line like this one:
\\
\textarabic{\char64474 \char64475 \char64474 \char64475 \char64474 \char64475 \char64474 \char64475 \char64474 \char64475 \char64474 \char64475 \char64474 \char64475 \char64474 \char64475 \char64474 \char64475 \char64474 \char64475 \char64474 \char64475 \char64474 \char64475 \char64380 \char64381 \char64380 \char64381 \char64380 \char64381 \char64380 \char64381 \char64380 \char64381 \char64380 \char64381 \char64380 \char64381 \char64380 \char64381 \char64380 \char64381 \char64380 \char64381 \char64380 \char64381 \char64380 \char64381 \char64380 \char64381 \char64380 \char64381 \char64380 \char64381 \char64380 \char64381 \char64380 \char64381 \char64380 \char64381 \char64380 \char64381 \char64380 \char64381 \char64380 \char64381 \char64380 \char64381 \char64380 \char64381 \char64380 \char64381 \char64380 \char64381 \char64380 \char64381 \char64380 \char64381 \char64380 \char64381 \char64380 \char64381}
\end{document}

Answer 1

\char吞噬其后的空间（就像几乎所有的 TeX 基元一样），您需要插入一个明确的空格\charXXXX\  或以一个空组结束它\charXXXX{} （请注意两种情况下的尾随空格）。