Cách sử dụng
The expression "in/like a flash" means to do something very quickly or suddenly. This phrase is used when something happens or is done in a very brief amount of time. For example, if you run to the store and back very quickly, it can be said that you went to the store and back "in a flash." Likewise, if something disappears quickly, you can say that it "vanished like a flash." This phrase can be used in casual conversations or in formal writing.