(PP-LOC 
  (P 在)
                    
  (LCP 
    (NP 
      (NN 分局))
                    
    (LC 前)))
                    
(NP-SBJ 
  (-NONE- *pro*))
                    
(VP 
  (VC 是)
                    
  (VP 
    (ADVP 
      (AD 一团))
                    
    (VP 
      (VV 乱哄哄)))))
argm: 
                    在 分局 前          
                
arg0: 
                    *pro*          
                
argm: 
                    一团