8.1 Labio-Dental Fricatives /f，v/
基础科学

        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] >>