Cách sử dụng
The word 'counterfeit' means something that is fake or not genuine. It is usually used to describe things like money, jewelry, or documents that have been made to look like the real thing, but are not. So, if you find a $20 bill that looks like it's real, but it doesn't have the watermarks or security features, it might be a counterfeit bill. It's important to be careful and check if something is counterfeit, because it can be illegal and dangerous to use or sell fake items.