Cách sử dụng
The word 'buff' can mean two things: 1) Someone who knows a lot about a particular subject is referred to as a 'buff' of that subject. For instance, if someone knows a lot about airplanes, they could be called an 'airplane buff'. 2) 'Buff' can also mean someone with a muscular physique. They might be referred to as a 'fitness buff'. You would use the word 'buff' in casual conversation with friends or family, or in more formal settings like a presentation or essay. It's important to understand which context the word is being used in, to avoid confusion.