就好象北京人說話有自己的基調 (music), 上海人說話又自己的基調(music), 山東人說話有自己的基調(music)。。。
我們要找到美語的基調, which is not just pronounciation, it's intonation, speech music...
Which is still mystery to me. Maybe the only way is to listen to native speakers, then practise, imitate...