名词
中文翻译：免疫
同义词：
['immunity', 'inoculation']
例句：
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1. The vaccine is designed to protect against the flu virus.
这种疫苗旨在预防流感病毒。
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2. After receiving the vaccination, she felt much better.
接种疫苗后，她感觉好多了。
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3.The government has mandated that all citizens be vaccinated before entering public places.
政府要求所有公民在进入公共场所前必须接种疫苗。