(NP-SBJ 
  (-NONE- *pro*))
                    
(VP 
  (ADVP 
    (AD 无法))
                    
  (VP 
    (VV 攻破)
                    
    (NP-OBJ 
      (NN 保鲜)
                    
      (NN 技术))))
arg0: 
                    *pro*          
                
argm: 
                    无法          
                
arg1: 
                    保鲜 技术