  

      ,          ,                   ｡            ,        ｡

     YSPKPQZ       ,                ,       ｡

     :

     

	     	    	  	     	  	 	 
 	  	  	  	  	  	  	  
  	  	  	  	  	  	  	  
 	  	  	  	  	  	  	  
   	  	  	  	  	  	  	  
  	  	  	  	  	  	  	  
  	  	  	  	  	  	  	  
  	  	  	  	  	  	  	  
    	  	  	  	  	  	  	  
  	  	  	  	  	  	  	  
    	  	  	  	  	  	  	  

     :https://zhuanlan.zhihu.com/p/512378783  (                 )