en-;em-使成为 enable; enlarge; enslave encourage; embed; 前,向外 ex-president; ex-wife; export; extrabF extraordinary extra-curricular. extra- officialen-; em- 使成为 enable; enlarge; enslave; encourage; embed; ex- 前, 向外 ex-president; ex-wife; export; extra- 外 extraordinary; extra-curricular; extra-official;