标准美语发音的13个秘诀 CD 2 Track 38（在线收听）

Exercise 2-3: Spelling and Number Connect ions                               CD 2 Track 38 

You also use liaisons in spelling and numbers:  

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What's the Difference Between a Vowel and a Consonant? 

In pronunciation, a consonant  touches at some point in th e mouth. Try saying [p] with your mouth open—you can't do it because your lips must come together to make the [p] sound. A vowel, on the other hand, doesn't touch anywhere. You can easily say [e] without any part of the mouth, tongue, or lips coming into contact with a ny other part. This is wh y we are calling W, Y, and R semivowels, or glides.