粗体是粗体，但其他内容也是如此。斜体可以使用，但它们也始终是粗体。Schola Math 可以使用，因为我没有定义粗体字体。
\documentclass[oneside,12pt,letterpaper]{book}
\usepackage{xcolor}
\usepackage{contour}
\usepackage[letterpaper, total={6.5in, 9in}, left=1in, top=1in]{geometry}
\usepackage[T1]{fontenc}
\usepackage{siunitx}
\usepackage{textcomp}
\usepackage{fontspec}
\usepackage{pdfpages}
\usepackage[
colorlinks=true,
linkcolor=,
pdfpagelabels=true,
unicode=true,
pdfa
]{hyperref}
\usepackage{bookmark}
\newfontfamily\fonta{texgyreschola-regular.otf}[
BoldFont = texgyreschola-bold.otf,
ItalicFont = texgyreschola-italic.otf,
BoldItalicFont = texgyreschola-bolditalic.otf,
]
\newfontfamily\fontb{texgyreschola-math.otf}[
]
\newfontfamily\fontc{NotoSerifCJK-Medium.ttc}[ % I like the look of Medium, so it is "Upright".
UprightFeatures = {FontIndex = 0},
BoldFeatures = {FontIndex = 0},
BoldFont = NotoSerifCJK-ExtraLight.ttc, % ExtraLight chosen for "Bold" for contrast.
]
\pagestyle{empty}
\begin{document}
\fonta % Set the default font.
\title{{\fontc オペレーシヨん}}
\date{}
\setcounter{tocdepth}{3}
\noindent{\bfseries{\huge Table of Contents}\vspace \bigskipamount \par }
%% Schola: Regular -- Incorrect.
\contentsline {part}{Tex Gyre Schola Regular {\fontb ℉}℃\ }{2}{}
%% Schola: Bold -- Good.
\contentsline {part}{\textbf{Tex Gyre Schola Bold {\fontb ℉}℃}\ }{2}{}
%% Schola: Italic -- Incorrect.
\contentsline {part}{\textit{Tex Gyre Schola Italic {\fontb ℉}℃}\ }{2}{}
%% Schola: Bold Italic -- Good.
\contentsline {part}{\textbf{\textit{Tex Gyre Schola Bold Italic {\fontb ℉}℃}}\ }{2}{}
%% Schola Math: Good.
\contentsline {part}{{\fontb Tex Gyre Schola Math {\fontb ℉}℃}\ }{3}{}
%% Noto Serif CJK JP: Regular -- Incorrect.
\contentsline {part}{{\fontc Noto Serif CJK JP Medium {\fontb ℉}℃}\ }{4}{}
%% Noto Serif CJK JP: "Bold" -- Good.
\contentsline {part}{{\fontc \textbf{Noto Serif CJK JP Extra Light {\fontb ℉}℃}}\ }{4}{}
%% Noto Serif CJK JP: Regular -- Incorrect.
\contentsline {part}{{\fontc 本述オペレーシヨン}{\fontb ℉}℃\ }{5}{}
%% Noto Serif CJK JP: "Bold" -- Good.
\contentsline {part}{\textbf{{\fontc 本述オペレーシヨン}{\fontb ℉}℃}\ }{5}{}
\end{document}
我的引擎是 XeLaTeX。
所有字体都应该存在。
fc-list | grep -i "\(noto serif cjk jp\)\|\(texgyreschola-.*\.otf\)"
/usr/share/texmf/fonts/opentype/public/tex-gyre/texgyreschola-regular.otf: TeX Gyre Schola:style=Regular
/usr/share/texmf/fonts/opentype/public/tex-gyre/texgyreschola-bold.otf: TeX Gyre Schola:style=Bold
/usr/share/texmf/fonts/opentype/public/tex-gyre/texgyreschola-italic.otf: TeX Gyre Schola:style=Italic
/usr/share/texmf/fonts/opentype/public/tex-gyre/texgyreschola-bolditalic.otf: TeX Gyre Schola:style=Bold Italic
/usr/share/texmf/fonts/opentype/public/tex-gyre-math/texgyreschola-math.otf: TeX Gyre Schola Math:style=Regular
/usr/share/fonts/opentype/noto/NotoSerifCJK-ExtraLight.ttc: Noto Serif CJK JP,Noto Serif CJK JP ExtraLight:style=ExtraLight,Regular
/usr/share/fonts/opentype/noto/NotoSerifCJK-Light.ttc: Noto Serif CJK JP,Noto Serif CJK JP Light:style=Light,Regular
/usr/share/fonts/opentype/noto/NotoSerifCJK-Regular.ttc: Noto Serif CJK JP:style=Regular
/usr/share/fonts/opentype/noto/NotoSerifCJK-Medium.ttc: Noto Serif CJK JP,Noto Serif CJK JP Medium:style=Medium,Regular
/usr/share/fonts/opentype/noto/NotoSerifCJK-SemiBold.ttc: Noto Serif CJK JP,Noto Serif CJK JP SemiBold:style=SemiBold,Regular
/usr/share/fonts/opentype/noto/NotoSerifCJK-Bold.ttc: Noto Serif CJK JP:style=Bold
/usr/share/fonts/opentype/noto/NotoSerifCJK-Black.ttc: Noto Serif CJK JP,Noto Serif CJK JP Black:style=Black,Regular