When use hyphen between compound adjectives ✏️Compound adjectives: two words connected together in order to describe a noun. ✏️"hyphen" is a dash(—破折号) 👏A hyphen needs to be used in a compound adjective when it comes before a noun which u r referring to. Ex: She has a high-pitched voice. Ex: Her voice is high pitched.(no need to use hyphen) Number measurements Ex: He ate the whole one-full… Ex: a twelve-year-old carpet 👏How to form your own adjectives Ex: This is a parent-friendly cafe. Ex: This time-consuming work is stressing me out. Ex: I'm reading the most well-written book right now. Ex: He's a well-traveled person. Ex: I'm going on a seven-day cruise.