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

2?????????????

3?????????

4?????vx

5?????????

?????2????????17?????????? ???????????“??”??????????????????,??????????????????17???????????????????????,?????,?????????????????????????,???????

????,?????????“????”???????,??“????????‘?’”?????????????????????

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

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

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