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

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

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

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

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