virtosin

例句：

1. 1. Viruses can cause illnesses like the common cold and flu.
   病毒可以引起像普通感冒和流感这样的疾病。
2. 2. The virus spread rapidly throughout the city.
   这种病毒迅速在整个城市传播开来。
3. 3. To prevent infection, wash your hands frequently.
   为了预防感染，请经常洗手。