视频科普丨如果产生了一个全球性的流行病该怎么办？

It starts with a simple cough, and before you know it, millions of people are infected. And it won't stop there. It could keep growing and growing until billions of people are sick. Flights are canceled, cities are quarantined, and hospitals are flooded with patients. This is what's known as a global pandemic. Could we experience something like this? How would a pandemic affect civilization? How does something like this happen?And how could you avoid it?