Cách sử dụng
The word 'pandemic' is used to describe a disease that is spreading across the world, affecting many people in different countries. It is usually caused by a new virus or bacteria that people have not been exposed to before, so they do not have immunity. The COVID-19 pandemic is a recent example of a pandemic, as it has affected people all over the world and has caused many deaths. So, when you hear or read about a pandemic, it means that there is a dangerous sickness spreading all over the world, and people need to take extra precautions to stay safe.