me·di·as·ti·num /ˌmidiəˈstaɪnəm/
  縱隔
  me·di·as·ti·num /ˌmɪdɪəˈstaɪnəm/ 名詞
  縱隔
  Me·di·as·tine Me·di·as·ti·num n.  Anat. A partition; a septum; specifically, the folds of the pleura (and the space included between them) which divide the thorax into a right and left cavity. The space included between these folds of the pleura, called the mediastinal space, contains the heart and gives passage to the esophagus and great blood vessels.
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  mediastinum
       n : the part of the thoracic cavity between the lungs that
           contains the heart and aorta and esophagus and trachea
           and thymus
       [also: mediastina (pl)]