4.分别是：a[阿] an[安] ao[奥] ai[哀] ang[昂] o[喔] ong[翁] ou[欧] e[鹅] en[恩] er[儿] ei[唉] eng[摁] i[衣] ia[呀] iu[由] ie[耶] in[因] ing[英] u[乌] un[温] ua[蛙] uo[窝] ue[月] ui[威] ü[迂] iao[腰] ian[烟] iang[央] iong[用] ...