(NP-SBJ 
  (NP-PN 
    (NR 美国))
                    
  (DNP 
    (PP 
      (P 对)
                    
      (NP 
        (NP-SBJ 
          (NR 联合国))
                    
        (NP 
          (IP-APP 
            (NP-SBJ 
              (-NONE- *pro*))
                    
            (VP 
              (VV 维持)
                    
              (NP-OBJ 
                (NN 和平))))
                    
          (NP 
            (NN 任务)))
                    
        (NP 
          (NN 经费))))
                    
    (DEG 的))
                    
  (NP 
    (NN 分摊)
                    
    (NN 比例)))
                    
(VP 
  (PP-DIR 
    (P 从)
                    
    (QP 
      (CD ３１％)))
                    
  (VP 
    (VV 减为)
                    
    (QP-OBJ 
      (CD ２６％)
                    
      (CC 或)
                    
      (CD ２７％))))))))
arg1: 
                    美国 对 联合国 维持 和平 任务 经费 的 分摊 比例          
                
arg3: 
                    从 ３１％          
                
arg2: 
                    ２６％ 或 ２７％