12.1 Post-Alveolar Approximant /r/
基础科学

        Producing /r/1) Raise the tip of the tongue near to,but nottouching,the back of the upper alveolar ridge;2) Press the sides of the tongue against yourupper back teeth;3) Allow the air stream to pass freely,withoutfriction,over the central part of the tong......（本文共 4238 字, 1 张图）     [阅读本文] >>