知识贝壳
知识贝壳
所属栏目：英语语音
Producing /s/1) Raise the front part of the tongue toward the frontpart of the hard palate,but do not touch it;2) Place the sides of the tongue against the upper teeth;3) Be sure there is a narrow groove along the center ofthe tongue. The airstream escape ......（本文共 9370 字 , 2 张图） [阅读本文]>>