????,???????,????????????,???,???????????????????2??????????????????,?????????273??400????????,?????????????,???????661????????????2???5????,???????????450???,??600????
??????????????????,??????“??????????”??50?,?????10??7?????????????
(???????? ?????????????? ???????????????)
????????????:???
??????2???????????:????
?????????????????????
????:?????????????????
GIF-????!?????????????
??3?4?????????????????
??GIF-?????????????????
??????:?????????????????
????????????????????
????:???????????????
??????????:????,????!
????3????????:???????
??-???????????????2-1??
????:3???????????????
??:??????????????
????????????????????
4?7?22?????????
GIF-????!?????????????
GIF-????!?????????????
????:????????????????
???????????????????
????:?????????????????
???????????300??????(?)
????3????????:???????
??2?????????0.4%
????:??????????????!