You catch a cold when a virus infects your upper respiratory system.
当上呼吸系统感染了病毒，人就会得感冒。
Millions of fish were killed last year when a virus called infectious salmon anaemia swept through Chile's salmon farms.
去年传染性鲑鱼贫血病毒席卷了智利的鲑鱼养殖场，数百万鲑鱼死亡。
When a virus attacks your body, your body works hard to get rid of it.
当病毒攻击你的身体时，你的身体会努力摆脱它。
When a virus infects a person, it triggers a series of biochemical reactions in immune-system cells that literally may have life or death consequences.
当病毒感染人体，会激发一系列生化反应，导致免疫细胞存活或死亡的结局。
When a virus infects a person, it triggers a series of biochemical reactions in immune-system cells that literally may have life or death consequences.
当病毒感染人体，会激发一系列生化反应，导致免疫细胞存活或死亡的结局。
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