(NP-OBJ 
  (CP 
    (WHNP-1 
      (-NONE- *OP*))
                    
    (CP 
      (IP 
        (NP-SBJ 
          (NN 史前陶))
                    
        (VP 
          (PP-PRP 
            (P 因)
                    
            (IP 
              (IP 
                (NP-SBJ 
                  (-NONE- *PRO*))
                    
                (VP 
                  (NP-LOC 
                    (NN 户外))
                    
                  (VP 
                    (VV 坑烧))))
                    
              (PU 、)
                    
              (IP 
                (NP-SBJ 
                  (-NONE- *PRO*))
                    
                (VP 
                  (VP-FOC 
                    (VV 受热))
                    
                  (VP 
                    (ADVP 
                      (AD 不))
                    
                    (VP 
                      (VA 均)))))))
                    
          (VP 
            (MSP 而)
                    
            (VP 
              (VV 产生)
                    
              (NP-OBJ 
                (-NONE- *T*-1))))))
                    
      (DEC 的)))
                    
  (NP 
    (NN 烙痕)))
arg0: 
                    *PRO*