标准美语发音的13个秘诀 CD 4 Track 20（在线收听）
Exercise 8-6: The Middle "I" List CD 4 Track 20
The letter I in the unstressed position devolves consistently into a schwa. Repeat.
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标准美语发音的13个秘诀 CD 4 Track 20（在线收听） |
Exercise 8-6: The Middle "I" List CD 4 Track 20 The letter I in the unstressed position devolves consistently into a schwa. Repeat. 图片1 图片2 图片3 图片4 |
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