(IP 
  (ADVP 
    (AD 然而))
                    
  (PU ，)
                    
  (IP 
    (IP 
      (NP-SBJ 
        (-NONE- *pro*))
                    
      (VP 
        (VV 回顾)
                    
        (NP-OBJ 
          (DP 
            (DT 这)
                    
            (QP 
              (CD 一)
                    
              (CLP 
                (M 年))))
                    
          (DNP 
            (NP-PN 
              (NR 墨西哥))
                    
            (DEG 的))
                    
          (NP 
            (PP 
              (P 对)
                    
              (NP 
                (NN 外)))
                    
            (NP 
              (NN 贸易)))
                    
          (NP 
            (NN 形势)))))
                    
    (PU ，)
                    
    (IP 
      (NP-SBJ 
        (-NONE- *pro*))
                    
      (VP 
        (IP-ADV 
          (NP-SBJ 
            (-NONE- *pro*))
                    
          (VP 
            (VV 可以)
                    
            (VP 
              (VV 说))))
                    
        (VP 
          (VC 是)
                    
          (VP 
            (VV 喜忧参半)))))))
arg0: 
                    *pro* 
                
argm: 
                    *pro* 可以 说 
                
argm: 
                    然而