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

2???????vx

3???????

4?????

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

????????????2????4?? (??????????? ????????????)????3?,???????????????,?????????,?????????

??????,???????????????????????????????????????????????,????????????????????2??18??????????“???,???????????????”????

?????????????????????80????????????,?????????????,????????,??????????,??????????????

????2???????????3?,?????????????,??2??????? ?????? ??? ??

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

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

?????????????????15?,??????????1?????????????2????1??(????????????????????????)

??:???????