(NP-SBJ 
  (-NONE- *pro*))
                    
(VP 
  (DP-ADV 
    (DT 每)
                    
    (CLP 
      (M 次)))
                    
  (NP-TMP 
    (QP 
      (CD 一)
                    
      (CLP 
        (M 个)))
                    
    (NP 
      (NN 月)))
                    
  (VP 
    (VV 驻点))))
arg0: 
                    *pro*          
                
argm: 
                    每 次          
                
argm: 
                    一 个 月