viral flacherie

例句：

1. 1. Viruses are responsible for many diseases in humans and animals.
   病毒是人类和动物许多疾病的罪魁祸首。
2. 2. The virus has spread rapidly across the globe.
   这种病毒已经迅速在全球范围内传播。
3. 3. We need to take precautions against the spread of the virus.
   我们需要采取措施防止病毒的传播。