(NP 
  (CP 
    (WHNP-2 
      (-NONE- *OP*))
                    
    (CP 
      (IP 
        (NP-SBJ 
          (-NONE- *T*-2))
                    
        (VP 
          (PP-MNR 
            (P 以)
                    
            (IP 
              (NP-SBJ 
                (-NONE- *PRO*))
                    
              (VP 
                (VV 了解)
                    
                (NP-OBJ 
                  (NP-PN 
                    (NR 孔子))
                    
                  (NP 
                    (NN 政治)
                    
                    (PU 、)
                    
                    (NN 教育))
                    
                  (NP 
                    (NN 活动))))))
                    
          (VP 
            (VV 为)
                    
            (NP-OBJ 
              (ADJP 
                (JJ 主要))
                    
              (NP 
                (NN 内容))))))
                    
      (DEC 的)))
                    
  (IP-APP 
    (NP-SBJ 
      (-NONE- *PRO*))
                    
    (VP 
      (VV 周游)
                    
      (NP-OBJ 
        (NN 列国))))
                    
  (NP 
    (NN 游)))
arg0: 
                    *PRO* 
                
arg1: 
                    列国