in·tra·mu·ral /-ˈmjʊrəl/
  (a.)校內的,內部的
  in·tra·mu·ral /-ˈmjʊrəl/ 形容詞
  壁內的
  In·tra·mu·ral a.
  1. Being within the walls, as of a city.
  3. Anat. & Med. Being within the substance of the walls of an organ; as, intramural pregnancy.
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  intramural
       adj : carried on within the bounds of an institution or community;
             "most of the students participated actively in the
             college's intramural sports program" [ant: extramural]