( 
  (IP 
    (NP-SBJ 
      (-NONE- *pro*))
		
    (VP 
      (DVP 
        (ADVP 
          (AD 牢牢))
			 
        (DEV 地))
		    
      (VP 
        (VV 夹)
			
        (PP 
          (P 在)
			    
          (LCP 
            (NP 
              (QP 
                (CD 两)
					 
                (CLP 
                  (M 辆)))
				     
              (CP 
                (WHNP-1 
                  (-NONE- *OP*))
					 
                (CP 
                  (IP 
                    (NP-SBJ 
                      (-NONE- *T*-1))
						 
                    (VP 
                      (VP 
                        (VP 
                          (VV 呼啸)
							     
                          (AS 着))
							 
                        (PU （)
							 
                        (VP 
                          (VV 咩咩)
							     
                          (AS 着))
							 
                        (PU ？)
							 
                        (PU ）))
						     
                      (VP 
                        (VV 开下)
							 
                        (NP-OBJ 
                          (NP-PN 
                            (NR 俄勒冈州))
								 
                          (NP 
                            (NN 南部))
								 
                          (DP 
                            (DT 某)
								     
                            (CLP 
                              (M 处)))
								 
                          (DP 
                            (DT 某个))
								 
                          (DNP 
                            (ADJP 
                              (JJ 陡峭))
								      
                            (DEG 的))
								 
                          (NP 
                            (NN 山关))))))
					     
                  (DEC 的)))
				     
              (NP 
                (NN 拖车)))
				 
            (LC 之间)))))
		
    (PU ，)))
arg0: 
	  *T*-1