??????????????2??????21??? (????)?????????21??,?,??????????,???????????????,??????????????“????????????????”?,???

??????????????????????????????????????,???????????????????????,??????????,??;??,????????“??”????,??????;?????????,??,?????????

??????????????,????????????????????????????,????????????????,??16????????,??????23???????,?????13?????????????35???45?????????????????,???50%?

????????????????,????????????????,??????;????????????????,?????????????????????????????????????????,????????????????????1?????????,????????????????(??????????) ??????:??????????

??

??:???????????,??????????,??????????????