(IP 
  (NP-SBJ 
    (NN 蜘蛛)
                    
    (NN 丝))
                    
  (VP 
    (VP 
      (VC 是)
                    
      (NP-PRD 
        (CP 
          (WHNP-1 
            (-NONE- *OP*))
                    
          (CP 
            (IP 
              (NP-SBJ 
                (-NONE- *T*-1))
                    
              (VP 
                (LCP-LOC 
                  (NP 
                    (NN 大自然))
                    
                  (LC 中))
                    
                (ADVP 
                  (AD 最))
                    
                (VP 
                  (VA 好))))
                    
            (DEC 的)))
                    
        (NP 
          (NN 纤维))))
                    
    (PU ，)
                    
    (VP 
      (CC 又)
                    
      (VA 亮)
                    
      (CC 又)
                    
      (VA 韧))))
arg0: 
                    蜘蛛 丝