名词
中文翻译：免疫学上有效的细胞
同义词：
['immunocompetent cell', 'immunologically competent cell']
例句：
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1. The immune system is the body's defense against infections.
免疫系统是身体对抗感染的防御系统。
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2. This vaccine is designed to protect against a specific strain of influenza.
这种疫苗旨在保护免受特定流感株的侵害。
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3. In order to fight off infections, the immune system needs to be effective.
为了抵抗感染，免疫系统需要有效。