?? ?? “???????”?????“?????????????”
????:1?????????????:??????sn
2?????
3???????
4???????
5??????????
??????????? (??????)??????????,????“????????”??????????,?????????,?????????????????????????,?????????,???,???????????????????
?????K???????????????,??????????????,??“?????????”????,?????“???????????,?????????????,???,??,???”??????????????,????,????????????????,????????????????,?????????????
?????????????,???,????????????????????????????,???????????,??????
????,?????????????????????????????,??????,??????????,?????????????
???????,????????“????”???????“??????????”,????????,??????????????? “??????????????????????????”,???????,???????????????????????,?????????????(???????????????) ????????:?????