Add one space before each English word after Chinese characters [closed]

Question

I often mix English words in my Chinese texts. When doing that, I want to add a space before the English words. For example:

XXXX wwwww wwwww wwwww XXXX
    *

where X's are Chinese characters and w's are English letters.

The only problem is the space marked *, where the Chinese characters end and the English words start. Latex seems to swallow up that space, but I want it to be there.

Is there an automatic command that can handle this?

PS: right now my solution is to manually add a space by '\ ' whenever I insert English.

Answer 1

I found that my problem is gone when I run XeLatex in TexMaker with this:

\documentclass[12pt, UTF8, nofonts]{article}
\usepackage{xeCJK}
\usepackage{fontspec}
\setCJKmainfont{SimSun}

I used the pdfLatex command and apparently, it is not good at handling some subtleties of Asian texts. Now the space between English and Chinese texts is added automatically.