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

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

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

????????:??? “?????????”????

?? ????|???? ????

????:1??????????:????a5??

2?????vx

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

4???????

5???????????

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

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

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

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