Cách sử dụng
The word 'invisible' means that something cannot be seen by the human eye. We can use this word to describe things that are not apparent in our surroundings like air or gases, microorganisms that are too small to be seen, and things that are intentionally hidden from sight. For example, a spy might be described as invisible because they are hiding so well that nobody can see them. In general, we use this word to talk about things that cannot be seen or noticed easily.