... 获得性免疫系统: aquired immunity 获得性免疫耐受: acquired tolerance 天然获得性免疫: natural acquired immunity ...
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But knowing how much natural immunity has been acquired through infection is more difficult, especially given the very mild nature of illness in the vast majority of patients.
但很难说清因感染获得了何种程度的天然免疫力，尤其是因为在绝大多数患者身上，疾病的性质非常温和。
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