(IP 
  (NP-SBJ 
    (ADJP 
      (JJ 唯一))
                    
    (CP 
      (WHNP-1 
        (-NONE- *OP*))
                    
      (CP 
        (IP 
          (NP-SBJ 
            (-NONE- *pro*))
                    
          (VP 
            (ADVP 
              (AD 比较))
                    
            (VP 
              (VA 挂心)
                    
              (NP-OBJ 
                (-NONE- *T*-1)))))
                    
        (DEC 的))))
                    
  (PU ，)
                    
  (VP 
    (VC 是)
                    
    (NP-PRD 
      (QP 
        (CD 三)
                    
        (CLP 
          (M 个)))
                    
      (CP 
        (WHNP-2 
          (-NONE- *OP*))
                    
        (CP 
          (IP 
            (NP-SBJ 
              (-NONE- *T*-2))
                    
            (VP 
              (ADVP 
                (AD 分别))
                    
              (VP 
                (VC 为)
                    
                (QP-PRD 
                  (QP 
                    (CD 七)
                    
                    (CLP 
                      (M 岁)))
                    
                  (PU 、)
                    
                  (QP 
                    (CD 五)
                    
                    (CLP 
                      (M 岁)))
                    
                  (CC 和)
                    
                  (QP 
                    (CD 两)
                    
                    (CLP 
                      (M 岁)))))))
                    
          (DEC 的)))
                    
      (NP 
        (NN 孩子)))))
arg0: 
                    *pro* 
                
arg1: 
                    *T*-1 
                
argm: 
                    比较