[Font] How does Gtk show a string contains different languages?

["raymond Liu" <drray lkc gmail com>]

Hi all,

   I'd like to know how Gtk does it.
   The default font is Tahoma.
   And I think Tahoma doesn't support Chinese(zh_TW/zh_CN).

Q1.
   If I need to show a string contains English and Chinese using Tahoma.
   How doest Gtk show them?

Q2.
  Can I use the different fonts for them?
  Ex.
  English uses "Tahoma" ,and Chinese uses "AR PL New Sung" in a string label.

  Please tell me which file I shall trace.
  Any information will be appreciated.
  Thank you !

BR,
Raymond