我目前的方法源自 https://tex.stackexchange.com/questions/323548/conflict-between-mathabx-and-amssymb 和 https://tex.stackexchange.com/questions/14386/importing-a-single-symbol-from-a-different-font ```tex \documentclass{article} % Setup the matha font (from mathabx.sty) \DeclareFontFamily{U}{matha}{\hyphenchar\font45} \DeclareFontShape{U}{matha}{m}{n}{ <5> <6> <7> <8> <9> <10> gen * matha <10> matha10 <12> <14> <17> <20> <24> matha12 }{} \DeclareSymbolFont{matha}{U}{matha}{m}{n} \DeclareFontFamily{U}{mathx}{\hyphenchar\font45} \DeclareFontShape{U}{mathx}{m}{n}{ <5> <6> <7> <8> <9> <10> <10> <12> <14> <17> <20> <24> mathx10 }{} \DeclareSymbolFont{mathx}{U}{mathx}{m}{n} \DeclareFontSubstitution{U}{mathx}{m}{n} \DeclareMathDelimiter{\ldbrack}{4}{matha}{"76}{mathx}{"30} \DeclareMathDelimiter{\rdbrack}{5}{matha}{"77}{mathx}{"38} \begin{document} \[ x + y \ldbrack z \rdbrack \] \end{document} ```