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2?2021??????

3????????

4???????

5??????????

????12??????????????????20??????????????? (?????????)????(CDC)????????,??????,?????????????414?,?????????69???????

???20???????????????,2024????????146????????????????,????????????54%;??????????????????????40%?

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??1994????????8???,??????????,??????????????????????????18?,??????????????????????,?,?????????????,??

??????????????????????????????,??????????????2020??????????????????,??????????????????,?????(??????????????????) ??:??