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

2????????

3???????sn

4?????????

5?92,93,95,98?????

?9???2??? ???,??????????9?????????????????2????????????,???,????,????????9?????????

?????????:???

???,?????????9??,???????????,“??????,???”

??????,“?,????????????”

?????????????,???????????30????,????????9???????,????????????????????

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

????????:??????