Cách sử dụng
The expression "be common/public knowledge" means that something is widely known and understood by most people. It implies that the information or knowledge is not a secret or confidential and can be talked about openly. For instance, it is common/public knowledge that smoking is harmful to health. This means that most people know and understand that smoking can lead to health complications like lung cancer, respiratory issues, heart problems, among others. Another example can be the fact that the earth rotates around the sun every year, which is common/public knowledge. It means that most people know and understand that the earth moves around the sun in a fixed orbit. So, whenever you use this expression, you are referring to information or knowledge that is widely known and understood by most people.