???:???
“??????sn”????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
??????
?????
??????
??????
??????
??????
??
??????????????????
??????????????????
??
????:
1???????sn:????vx
2???????????
3???????wx
4???????
5??????????
???:???
????
6
%
???:??