?? ???????? ????????????
????:1???????????:??????????
2??????????
3?????
4?????????
5???????sn
12??11?????????,?????????????????
????:??????12???10??????????????,????????????????,??????????????????????????????????
????????????,????????,???????????“??”??????,?????????????????,????,???????????,??????????????,??????????
???????,????,?????,????????????????
?????????????????,????????,?????,??,??????????,???????????,????,???????????,?????????????????????????,?????????????????????????????“?????????”????,????“???????????????”??,??????
??,????????,?????“?”???????????,????????,??????????????????????,?????????(?????? ???)
????????????????:???