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central vowels,diphthongs

vowels: front vowels & central vowels
vowels: front vowels & central vowelsdescription of the vowels front & central vowels/82:/ high
description of the vowels front & central vowels/82:/ high中元音central vowelsppt
中元音central vowelspptenglish front vowels & central vowels
english front vowels & central vowelsenglish front vowels & central vowels
english front vowels & central vowels
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