知识贝壳
知识贝壳
所属栏目：英语语音
All the sounds we make when we speak are the result of muscles contracting. The muscles in the chest that we use for breathing produce the flow of air that is needed for almost all speech sounds; muscles in the larynx produce many different modifications ......（本文共 5072 字 , 1 张图） [阅读本文] >>