?2????????????1??,?????????????? ?
????????????2????????????1??,???? ?
??2?1??,??? ?
?2??1??,??? ?
?2????????????1??,????? ??
??2??1??,??? ?
??2?1?,?????????????? ?
?????????????:??
??GIF-?????????????????
????:????????10?20?8
??????????????????
???:??????????????????
???:?????????????????
???????:????48???????
?????20????????????????
GIF-??????????????????
????:?????????????????
????:?????????????????
??????????????????????????
????:???????????????
4?1?!??????????????????!
????:?????????????????
??2?????????0.4%
??????????????4?????2??
????:??“??????”?????????
?????????????????????
????:????????????????3.3?
???2???????188??????16??
??????2???????????:????
??:???????????????????
????:????????????????
??-??????????????1-0??
???:?????3?????????????