?? “????????????”??????
????:1?????????:??????
2?????vx
3???????
4???????
5?????????
???11?????23?? (? ??????????)23????,????????????????????????,“??”???????????,???,???????????,???,?????
???????????:“?,??‘??’,???‘???????’????‘??’,?‘???????’????,???,23?????8???,????,?????????”
??,???,???????????????????????,????????????,???,????“?????????????”????????????????“??”????,????7.52????,???????????????9.69?????????????
?????????,???????????????????????????,?????????????????????“?????????”,??“???+???”????????????,???“?????????”???,??,????“????????????”?(??????????) ????:?????????