(IP 
  (NP-SBJ 
    (-NONE- *pro*))
                    
  (VP 
    (VCD 
      (VV 还本)
                    
      (VV 付息))
                    
    (QP-OBJ 
      (CD 一百八十一点六亿)
                    
      (CLP 
        (M 美元)))))
arg0: 
                    *pro* 
                
argm: 
                    一百八十一点六亿 美元