tense A tense vowel requires you to use a lot of facial muscles to produce.
tense A tense vowel requires you to use a lot of facial muscles to produce.
要发一个长元音，你得动用很多面部肌肉。
tense A tense vowel requires you to use a lot of facial muscles to produce.
要发一个长元音，你得动用很多面部肌肉。