1、诠释：
原则一：耽误發音
In saying your words, imagine that they come out as if they were bounding lightly down a flight of stairs. Every so often, one jumps up to another level and then starts down again. Americans tend to stretch out their sounds longer than you may think is natural. So to lengthen your vowel sounds, put them on two stair-steps instead of just one.
The sound of an American speaking a foreign language is very distinctive, because we double sounds that should be single. For example, in Spanish or Japanese, the word NO is, to our ear, clipped or abbreviated.
轻松腔调操练：
Take a rubber band and hold it with your two thumbs. Every time you want to stress a word by changing pitch, pull on the rubber band. Stretch it out gently; don’t jerk it sharply. Make a looping figure with it and do the same with your voice. Use the rubber band and stretch it out every time you change pitch. Read first across, then down.