Vivian Lai
Vivian Lai
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什么是免疫力
4 minutes
Posted May 15, 2021 at 8:33 am.
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免疫力是人体的一种防御机制，阻挡外界病菌对我们机体的侵入人。人体免疫系统即是"海关:又是"警察"
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