Simple Classification of English Vowels and Consonants
1.Classifation of English Vowels
a)Monophtongs
1)Front Vowels
2)Back Vowels
3)Central Vowels
b)Diphtongs
1)Rising Diphtongs
2)Centering Diphtongs
phonetic
原文：http://www.cnblogs.com/gengsc/p/6848190.html
