?? ???????????????????
????:1????????????:????
2??????
3??????????
4????????
5?????vx
????????? ???????????
?1????3??????? (? ????????? ?????????????)??,???,???,???????,??????????????????????????????,??????????????????,???
????????????? ?????,????????????????????,??,???,??“???”“??????”,????????
???????? ????,????????,?????????,????????“??”?(??)
???:???????????????????