(ADVP 
  (AD 不料))
                    
(NP-SBJ 
  (NN 机车)
                    
  (NN 车主))
                    
(VP 
  (ADVP 
    (AD 一气之下))
                    
  (VP 
    (VSB 
      (VV 飞奔)
                    
      (VV 追车)))))
argm: 
                    不料          
                
arg0: 
                    机车 车主          
                
argm: 
                    一气之下