(CP 
  (WHNP-2 
    (-NONE- *OP*))
                    
  (CP 
    (IP 
      (NP-SBJ 
        (-NONE- *pro*))
                    
      (VP 
        (VCD 
          (VV 击落)
                    
          (VV 击伤))
                    
        (NP-OBJ 
          (-NONE- *T*-2))))))
                    
(NP 
  (NN 敌机)))
arg0: 
                    *pro*          
                
arg1: 
                    *T*-2 -> 敌机