????????? ??????????????

????2??12???????????? ????,??,??????????????????????????????4~8?????,????????10?;??????????????????????????6~8????????????????,?????????10~11?????????

????????,?,??4~5???,?????????????????????????????????4~6?,??8?,???????????????8~10??????????????????????????????????????????????6~7???

????,???,????????????????????????,??;?????????????????????,???

??????,????,???????;??,???????????;??????????????????,??????????