8.2 Dental Fricatives /θ， &240;/
基础科学

        Producing /θ/1) Place the tip of the tongue close to the upper teeth;2) Hold the lips slightly open;3) Breathe out the air through the narrow passage,makinga voiceless continuant;4) Do not vibrate the vocal folds.Producing /&240;/1) This sound is produced......（本文共 6968 字, 2 张图）     [阅读本文] >>