名词
中文翻译：自然主动免疫
同义词：
['natural immunity', 'natural immunity']
例句：
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1.The vaccine provides a natural active immunity against the virus.
疫苗提供了对病毒的自然主动免疫。
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2.The immune system is naturally active and can provide protection from many diseases.
免疫系统是自然的，可以提供对许多疾病的保护。
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3.The natural active immunity of the vaccine has been shown to be effective in preventing the spread of the disease.
疫苗的自然主动免疫已被证明在预防疾病传播方面是有效的。