人体通过两种方式抵抗流感：通过被称为抗体的蛋白质与病毒结合，阻止病毒复制；通过免疫细胞追击并消灭已经感染的细胞。
The body has two lines of defence against flu: proteins called antibodies that bind to viruses and stop them replicating, and immune cells that can hunt out and destroy infected cells.
人体通过两种方式抵抗流感：通过被称为抗体的蛋白质与病毒结合，阻止病毒复制；通过免疫细胞追击并消灭已经感染的细胞。
The body has two lines of defence against flu: proteins called antibodies that bind to viruses and stop them replicating, and immune cells that can hunt out and destroy infected cells.
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