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。
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。
Stewart took over yesterday when Russell was debilitated by a stomach virus.
昨天因拉塞尔患有肠炎身体变得虚弱，斯图尔特已经接管了他的工作。
The virus is released when an attachment to a fake e-mail message is opened.
当假的电子邮件附件被打开时，病毒就会被释放出来。
Taking antibiotics when you have a virus may do more harm than good.
当病毒感染时用抗生素，害处多过益处。
Taking antibiotics when you have a virus may do more harm than good.
当病毒感染时用抗生素，害处多过益处。
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