这个教程非常好，详细介绍了美音的发音特点，讲解是纯英文讲解，文本和音频不能完全同步，请有一定基础的朋友学习！英文名称：The Sound and Style of American English
I WANT TO REDUCE MY ACCENT.
WHAT DO I HAVE TO DO FIRST?
There are two basic skills you must learn right away if you want your speech to sound more American. First, you must learn the correct INTONATION. Intonation means the pitch changes and rhythms of a language or dialect. Once you begin Americanizing your intonation, native speakers will almost immediatlely become more comfortable with your speech and begin following your ideas much more easily. Second, you must change the way you move your moth muscles during the speech. Every language or dialect hs a unique way its speakers move their mouths. This leads to the language's special "sound" -- its very own resonance or voice tone. To reduce your accent, you must stop using the muscles as you did with your first language and substitute movements that produce this uniquely American tone. The first two-thirds of this audio contains exercises that teach you to produce American intonation and voice tone.