??
????2???13?? ???13???,??,??,??????????????????????6~8????????,????????????????10~12?????????????,?????????4~8???????,???10??
???????????????,????,???????????????????4~5??????,???????????????????????????????4~6???????????????????????????????6~7???
???????????????,????????14??????15??,????????????????????????,?????????????,???????????????????;??,?????????????????,?????
??,????????,??????;???????????????,????????,???
????????????:??????????????
?????????????????????? ?????????????????????????