(IP 
  (ADVP 
    (AD 但))
                    
  (NP-SBJ 
    (CP 
      (WHNP-1 
        (-NONE- *OP*))
                    
      (CP 
        (IP 
          (NP-SBJ 
            (PN 它))
                    
          (VP 
            (VV 留给)
                    
            (NP-IO 
              (NN 后人))
                    
            (NP-OBJ 
              (-NONE- *T*-1))))
                    
        (DEC 的)))
                    
    (NP 
      (NN 血泪)
                    
      (NN 教训)
                    
      (CC 与)
                    
      (NN 痛苦)
                    
      (NN 经验)))
                    
  (PU ，)
                    
  (VP 
    (ADVP 
      (AD 还))
                    
    (VP 
      (VV 需要)
                    
      (VP 
        (VV 继续)
                    
        (VP 
          (ADVP 
            (AD 认真))
                    
          (VP 
            (VV 总结)))))))
arg0: 
                    它 
                
arg1: 
                    *T*-1 
                
arg2: 
                    后人