(IP 
  (NP-SBJ 
    (-NONE- *pro*))
                    
  (VP 
    (IP-ADV 
      (NP-SBJ 
        (-NONE- *PRO*))
                    
      (VP 
        (ADVP 
          (CS 虽然))
                    
        (VP 
          (VA 安全))))
                    
    (PU ，)
                    
    (ADVP 
      (AD 但是))
                    
    (VP 
      (VE 没有)
                    
      (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))))))
arg1: 
                    *PRO* 
                
argm: 
                    户外