(IP-OBJ 
  (IP-ADV 
    (NP-SBJ 
      (-NONE- *PRO*))
                    
    (VP 
      (VV 相较於)
                    
      (NP-OBJ 
        (CP 
          (WHNP-2 
            (-NONE- *OP*))
                    
          (CP 
            (IP 
              (NP-SBJ 
                (-NONE- *T*-2))
                    
              (VP 
                (VA 灵活)))
                    
            (DEC 的)))
                    
        (NP 
          (QP 
            (CD 四))
                    
          (NP 
            (NN 足)))
                    
        (NP 
          (NN 动物)))))
                    
  (PU ，)
                    
  (IP-ADV 
    (IP 
      (NP-SBJ 
        (CP 
          (WHNP-3 
            (-NONE- *OP*))
                    
          (CP 
            (IP 
              (NP-SBJ 
                (-NONE- *T*-3))
                    
              (VP 
                (VV 源自)
                    
                (NP-OBJ 
                  (NN 穴居)
                    
                  (NN 动物))))
                    
            (DEC 的)))
                    
        (NP 
          (NN 蛇类)))
                    
      (VP 
        (ADVP 
          (AD 既))
                    
        (VP 
          (VV 乏)
                    
          (NP-OBJ 
            (NN 四肢)))))
                    
    (PU ，)
                    
    (IP 
      (NP-SBJ 
        (NN 眼力)
                    
        (PU 、)
                    
        (NN 听力))
                    
      (VP 
        (ADVP 
          (AD 又))
                    
        (ADVP 
          (AD 都))
                    
        (ADVP 
          (AD 不))
                    
        (VP 
          (VA 佳)))))
                    
  (PU ，)
                    
  (NP-SBJ 
    (NN 毒牙))
                    
  (VP 
    (ADVP 
      (AD 几乎))
                    
    (VP 
      (VC 是)
                    
      (NP-PRD 
        (CP 
          (WHPP-4 
            (-NONE- *OP*))
                    
          (CP 
            (IP 
              (NP-SBJ 
                (-NONE- *pro*))
                    
              (VP 
                (PP-MNR 
                  (-NONE- *T*-4))
                    
                (VP 
                  (VV 猎食)
                    
                  (CC 与)
                    
                  (VV 御敌))))
                    
            (DEC 的)))
                    
        (ADJP 
          (JJ 唯一))
                    
        (NP 
          (NN 工具))))))
arg0: 
                    *pro* 
                
argm: 
                    *T*-4