标准美语发音的13个秘诀 CD 4Track 19（在线收听）

Exercise 8-5: Tense and Lax Vowel Exercise  CD 4Track 19 

Let's practice tense and lax vowels in context. The intonation is marked for you. When in doubt, try to leave out the lax vowel rather than run the risk of overpronouncing it: l'p in place of lip, so it doesn't sound like leap. Repeat:

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In the time you have taken to reach this pointin the program, you will have made a lot of decisions about your own individual speech style. Pronunciation of reduced sounds is more subjective and depends on how quickly you speak, how you prefer to express yourself, the range of your intonation, how much you want to reduce certain vowels, and so on.