??
????????????????????2?????19???? (????????????????????? ???????????????)??????(????????????19?????????????)??????19???,????6??
6??????????????:??????????“????”????????“?????”?????????????????????????????????????“?????+??????”??????????????????????????????????????????“????????????”???????????????????????????????????????“????”?????????????
??????????,???????????????,??,?????????????????????,?????????????
?????,?,?????,????,??????,????????????????
??,??“??”????“??”?“?????”????????????????,??????????????????????,?????????????,??“??????”????????????????
?????“?????????+??”?,????“?????+??????????????????????+X”?????????,?????????“????????????”?????????????,??????????????????????????????
????????????“??”????????????,????(??????),??????????????????????????????“????”??,???????????????“??”,?????????
??,?????????“?”???????????????????????????????????????,??,?????????????????????,?????????????????,????????????????????????“???????????????”+“???”???????????????
???????????????????????,??????????(????????????????)??,???,?????,????,????,??,?,???,?????,??????(???) ???????????:????
?????????
????????????6????????????????????