Cách sử dụng
The word 'supplementary' means something extra or additional. It is used when you need something more to complete or support something that already exists. For example, if you are reading a book and there are some extra notes or explanations at the end of the book, those notes can be called supplementary material. Similarly, if you are taking a course and you need some additional resources to understand the topics better, those resources can be called supplementary materials. In short, the word 'supplementary' is used to refer to something that adds or supports something that already exists.