%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% 页面设定
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\geometry{
  textwidth=138mm,
  textheight=215mm,
  left=27mm,
  %% or
  %% inner=23mm,
  right=27mm,
  %% or
  %% outer=18mm,
  top=25.4mm, bottom=25.4mm,
  headheight=2.17cm,
  headsep=4mm,
  footskip=12mm,
  heightrounded,
}