标准美语发音的13个秘诀 CD 4 Track 31（在线收听）

Exercise 10-1 : When S Becomes Z      CD 4 Track 31 

Under Contrast, in the list that follows, notice how the voiced wordis drawn out and then repeat the word after me. Both voiced and unvoiced diphthongs have the underlying structure of the tone shift, or the double stairstep, but the shift ismuch larger for the voiced ones.

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