When mixing Chinese text and non-math mode numbers together within a sentence, narrow numbers are given the same amount of space as characters:
\documentclass{article}
\usepackage{ctexcap}
\usepackage{fontspec}
\usepackage{xeCJK}
\setCJKmainfont{Adobe Heiti Std}
\begin{document}
第1号
\end{document}
In most situations, this appearance is probably ideal, however, in my case, I need to temporarily change this spacing, in a small number of instances. How can I force the characters to be printed closer to the "1" one has the same spacing it would have if it were placed among English text (with no spaces on either side)?