????:1??????????:????200?????

2???????

3???sn??

4????????

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

???????????2????????????6????????????? (?? ??????????)?,?????????“?????????”?2???????6????????????,????,?,????????????8??

???,2??????????5?8??,???????????????????????????6??????????8?,???????????????10??????8????????????,????????0??,?????0??

????????,????????????????5???????????????15?;????????????10??11???“??”,??,???????????,???,??

6???8?????,?,???????8??,???????1????????????2?;??????????????2?,?3????2?,??????8???5?,????????????????

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