{\kaiGB{}} % 由于未知的bug，第一次使用kaiGB前面会有空格

这个问题的解决方法，前面加一个这个\kaiGB{~}，让无用内容把这个空格占了

\setCJKfamilyfont{songbold}{SIMSUN.TTC}[
Path = ./fonts/,
FakeBold = 2.5
]
\newcommand{\songbf}[1]{%
{\CJKfamily{songbold}#1}%
}

这里在附上粗体宋体的实现，\songbf{}

The issue describes a bug where the \kaiGB{} command adds an unwanted space on first use. The suggested fix is to prepend \kaiGB{~} to consume the space. Look for the definition of \kaiGB in the .tex or .sty files, likely in the main template or a package. Test the fix by compiling a minimal document with the command and checking the output. Verify the fix works by ensuring no extra space appears in the rendered PDF.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.