Cách sử dụng
"When we use the expression 'once in a lifetime', we mean that something is very special and rare, and it might only happen once in a person's life. For example, going on a safari in Africa or seeing the Northern Lights are 'once in a lifetime' experiences because they are very unique and not something that can be easily repeated. We can also use this expression to talk about opportunities that we might only get one chance at, like meeting a famous person or getting a dream job. It's a way to express that something is very special and not to be missed."