更新 structure.tex

Book/structure.tex

@@ -519,7 +519,7 @@ innerbottommargin=5pt]{cBox}
 \bookmarksetup{
 open,
 numbered,
-depth=3, %设置PDF的书签级别,3显示到subsection,4显示到subsubsection
+depth=2, %设置PDF的书签级别,2显示到subsection,3显示到subsubsection
 addtohook={%
 \ifnum\bookmarkget{level}=0 % chapter
 \bookmarksetup{bold}%