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1.The study of the immune system is crucial for understanding how our bodies fight off infections.
研究免疫系统对于理解我们的身体如何对抗感染至关重要。
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2.Antibodies are proteins that help the body fight off diseases.
抗体是帮助身体抵抗疾病的蛋白质。
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3. The discovery of a new vaccine against the flu has raised hopes for a better future.
发现一种新的针对流感的疫苗，为更好的未来带来了希望。