source: Rachel's English 2011年3月26日
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website: http://www.RachelsEnglish.com
How to Pronounce OH [oʊ] diphthong: American Accent 4:46
How to Pronounce OW [aʊ] diphthong 5:11
How to Pronounce AI [aɪ] diphthong 4:57
How to Pronounce OY diphthong [ɔɪ] 4:20
American vs. British English - Vowel Sounds - Pronunciation differences 7:00
