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枫下沙龙 / 谈天说地 / 这是免疫的定义:Protection from an infectious disease. If you are immune to a disease, you can be exposed to it without becoming infected. 即,一旦你身体产生免疫能力,即使病毒🦠爬遍你全身,你也不会受到感染。
-111111(快乐老家);
2021-7-20
(#13865588@0)