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

????:???????:?????

???????????????12??2????????? ??,??????,??,?????????????????????????????????????????????????6~8???????????,??????9~10??????,??????????????????6~10??????,??????12~18????????????,??,?????????????

???????????,??????????????4~8?,?????????,????????????,??????12~16?????,???????,?????????????????????????????????????????????????????????????????5~6?????????7~8??

???,????,?????????,??,??,????,??????,??????????????

???:???????????