????:1?????????:????????

2??????????

3???????vx

4?????

5???????

??????????????????9???????5???? (???????? ????)???5????“?????”,????????????????????????????????“??”?

??9????????5??,??,???????“???????????”??????????? ?????????? ????????????????? ??????????????????????

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

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

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

?????????????20????,????????????????????,??????,???????????,?????

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

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

???,?????,????“???”????????????,?????

????,“???????,???????????”(????)

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