?? ?2??????????4?
????:1?????q:??????
2???????
3????????????
4?????
5?????
???2??7? ??7???,?2??????????????????????????????????4??????
????????????????«??????????»?????????????????,???7????????????????1????????????????30??,?????,??
??7??????2??20???,?,???1?,?????????????4????????7??????????????
??,??????????????????,???????????????,??
???,???,????????,???????(???????????????????????) ??:????????????