(IP 
  (NP-SBJ 
    (-NONE- *pro*))
                    
  (VP 
    (VV 表示)
                    
    (IP-OBJ 
      (NP-SBJ 
        (DNP 
          (NP-PN 
            (NR 台北))
                    
          (DEG 的))
                    
        (NP 
          (NN 家庭)
                    
          (NN 污水)))
                    
      (VP 
        (VE 有)
                    
        (IP-OBJ 
          (QP-SBJ 
            (CD 一半))
                    
          (VP 
            (VC 是)
                    
            (VP 
              (ADVP 
                (AD 直接))
                    
              (VP 
                (VV 流进)
                    
                (AS 了)
                    
                (NP-OBJ 
                  (NN 河川))))))))))
arg0: 
                    一半 
                
arg1: 
                    河川 
                
argm: 
                    直接