名词
中文翻译：Unknown
同义词：
['immunization', 'vaccination']
例句：
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1.Vaccines are used to protect againstdiseases.
疫苗用于预防疾病。
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2. Thevaccine is effective in preventingthe virus from spreading.
该疫苗有效防止病毒传播。
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3. Thenew vaccine has been approvedby the FDA.
新疫苗已获得FDA批准。