(IP 
  (NP-SBJ 
    (PU 「)
                    
    (DNP 
      (NP 
        (NN 场地))
                    
      (DEG 的))
                    
    (NP 
      (NN 限制))
                    
    (PU 」))
                    
  (VP 
    (ADVP 
      (AD 则))
                    
    (VP 
      (VC 是)
                    
      (NP-PRD 
        (CP 
          (WHNP-2 
            (-NONE- *OP*))
                    
          (CP 
            (IP 
              (NP-SBJ 
                (NN 捶丸))
                    
              (VP 
                (NP-PRP 
                  (-NONE- *T*-2))
                    
                (VP 
                  (VP 
                    (ADVP 
                      (AD 逐渐))
                    
                    (VP 
                      (VV 冷却)))
                    
                  (PU ，)
                    
                  (VP 
                    (ADVP 
                      (AD 并))
                    
                    (ADVP 
                      (AD 未))
                    
                    (ADVP 
                      (AD 广泛))
                    
                    (VP 
                      (VV 流行))))))
                    
            (DEC 的)))
                    
        (NP 
          (NN 原因))))))
arg1: 
                    捶丸 
                
argm: 
                    逐渐 
                
argm: 
                    *T*-2