?? ??:???????????????????
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2???????
3????????
4??????????
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?7??????????????14?? ??(CNN)??,????,20?????????????????,????
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?7??????????????14?? ??(CNN)??,????,20?????????????????,????
??????????:????????????????
????:1???????????:???????sn
2???????
3????????
4??????????
5???????????
?7??????????????14?? ??(CNN)??,????,20?????????????????,????
??????????:????????????????