名词
中文翻译：Unknown
同义词：
['抗原-抗体系统，抗原-抗体复合体']
例句：
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1. Theimmune system recognizes and attacks pathogensthat invade the body.
免疫系统识别并攻击入侵体内的病原体。
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2. The study of the immunesystem is crucial for understanding how the bodyfights diseases.
研究免疫系统对于理解身体如何抵抗疾病至关重要。
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3. Antibodies areproteins produced by the immune system to targetand neutralize foreign substances.
抗体是免疫系统产生的蛋白质，用于针对和中和外来物质。