知识贝壳
知识贝壳
所属栏目：英语语音
Producing /f/1) Raise the soft palate so that no air can escape throughthe nasal cavity;2) Press the upper teeth against the lower lip lightly so thatthe air can be forced out between the teeth and the lower lip;3) Produce the sound by forcing air out thr ......（本文共 7161 字 , 2 张图） [阅读本文] >>