名词
中文翻译：免疫
同义词：
['vaccination', 'vaccinations']
例句：
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1. The flu vaccine is recommended for everyone over 6 months old.
流感疫苗推荐给6个月以上的所有人。
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2. The doctor gave her a shot of the flu vaccine.
医生给她打了一针流感疫苗。
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3. The new vaccine is more effective than the old one.
这种新疫苗比旧疫苗更有效。