????:1???????:??????????

2????????

3???sn??

4????????

5??????

????????11??????????????????????24?????????????? (?????????? ??)11??23????????????,?“?????????”????????????????????????????????????????????????

????????????????

????????????????,??????????,??????????,?????????????????,????????????????

?????,???????????“???????????”???????,????

???,???????????????????????????,?????????????????,????????“????????”??,?????(????)

?????:?????