????:1???????????:??498??????

2?????vx

3????????py

4???????

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

?10??14?????(??????????? ??)10?????????????14?????????????,??????????????,2????“?”????

10????????????????????14???,?,2????????? ???

???????,?,?“???????????????”???,??

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

?????? ????????????

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

??:?????