English vowels are pronounced in three diffrent duration:
1. short vowel before voiceless consonats;
2. little longer for short vowels before voiced consonats;
3 long vowels
1. short vowel before voiceless consonats;
2. little longer for short vowels before voiced consonats;
3 long vowels
选择“Disable on www.wenxuecity.com”
选择“don't run on pages on this domain”
