enter code here我使用宏来定制一些图形和方程式的标题，但是 EM 系统无法处理它。
\renewcommand\thesubfigure{(\alph{subfigure})}
\newcommand\ddfrac[2]{\frac{\displaystyle #1}{\displaystyle #2}}
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! ==> Fatal error occurred, no output PDF file produced!
有没有办法不用宏来实现这些？
提前致谢。