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

2??????vx

3???????????

4??????????????

5?????????

????,??????????????(??????“??????”)????“????”?????,???

????“???”??,????????????????????????????,???«???»«?????»«??»«?????????????????????»«????»,??«????????????????»«??????»,????????«????????»???«??????????????????,????????»???????????????,???

??,??,???(???????????? ???????????????????? ?? ?????)

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