mentor

     mentor       / ˈmɛntɔr /

        an experienced person who advises and helps someone 
        with less experience over a period of time

1. (M-)【希神】曼托  ( Odysseus 的忠實朋友, 又為其子的良師 )
2. 良師益友
   
   
   
   
   
   
   http://oaadonline.oxfordlearnersdictionaries.com/dictionary/mentor
   
   
   http://tw.dictionary.search.yahoo.com/search?p=mentor&fr=yfp&ei=utf-8&v=0