Cách sử dụng
The word 'infra' is usually used as a prefix in English to denote something that is below or underneath. For example, "infrastructure" refers to the basic physical and organizational structures needed for a society to function, such as roads, buildings, and utilities. Another example is "infrared," a type of electromagnetic radiation that is below the visible spectrum of light. In short, 'infra' is used to describe something that is below, underneath or underlying.