etymology-I
1)inter-、intra-、intro-
三个前缀inter-,intra-和intro-还是有差别的。
inter-表between,如international那是between different nations;
intra-表within。比方intramural [,ɪntrə'mjʊər(ə)l] adj.校内的;内部的。城市内的。那是within the walls(词根mur-表墙壁);
intro-表into,如introduce介绍是to lead into