Cách sử dụng
The word 'expert' means someone who knows a lot about a particular subject or topic. You can use this word when you want to talk about someone who has a special skill or knowledge in something. For example, you can say "he is an expert in cooking" or "she is an expert in mathematics". It is commonly used in academic or professional environments when referring to someone who is knowledgeable and experienced in a field. You can also use this word when someone asks for your opinion or advice on a topic that you know a lot about.