( 
  (IP 
    (NP-SBJ 
      (-NONE- *pro*))
		
    (VP 
      (PP-PRP 
        (P 因为)
			    
        (IP 
          (IP 
            (NP-SBJ 
              (PN 我们))
				    
            (VP 
              (VV 从事)
					
              (NP-OBJ 
                (NP 
                  (NN 流感)
						    
                  (NN 病毒))
						
                (NP 
                  (NN 研究)))))
				
          (FLR 
            (SP 呢))
				
          (PU ，)
				
          (IP 
            (ADVP 
              (AD 就是说))
				    
            (PU ，)
				    
            (NP-SBJ 
              (-NONE- *pro*))
				    
            (VP 
              (IP-CND 
                (NP-SBJ 
                  (-NONE- *pro*))
						
                (VP 
                  (ADVP 
                    (AD 要))
						    
                  (VP 
                    (VV 说)
							
                    (IP-OBJ 
                      (NP-SBJ 
                        (DP 
                          (DT 这个))
									
                        (NP 
                          (NN 病毒)))
								
                      (VP 
                        (VE 有)
								    
                        (NP-OBJ 
                          (NN 变异)))))))
					
              (PU ，)
					
              (VP 
                (VV 可以)
					    
                (VP 
                  (VV 说)
						
                  (FLR 
                    (VC 是))
						
                  (IP-OBJ 
                    (IP 
                      (NP-SBJ 
                        (NN 病毒))
							    
                      (VP 
                        (ADVP 
                          (AD 一直))
								
                        (ADVP 
                          (AD 在))
								
                        (VP 
                          (VV 变异))))
							
                    (PU ，)
							
                    (CP 
                      (IP 
                        (ADVP 
                          (AD 就是))
								
                        (NP-SBJ 
                          (NN 变异))
								
                        (VP 
                          (VC 是)
								    
                          (VP 
                            (VA 绝对))))
							    
                      (SP 的))))))))))
		
    (PU 。)))
argm: 
	  就是	  
	  
arg0: 
	  变异