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

2???????

3??????????

4???????sn

5????????????

???11??24??? ?????????“?”?????????,???????????,???????????,??????????,?17????????

????????????????????????:“??”?

11???????????????16?????????????????10????????,??,???????,?????????,?????,??,??

????12?????,??,??????????????,?????????????????,??,?????????????,?????

14?????????????????????,?????????????????,3??????????????,?????

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

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