COMB in N-COUNT （与指人的名词连用，构成复合名词）表示“主要的”，“最重要的” Arch- combines with nouns referring to people to form new nouns that refer to people who are extreme examples of something. For example, your arch-rival is the rival you most want to beat. （与指人的名词连用，构成复合名词）表示“主要的”，“最重要的”