And with the OO vowel sound, as in 'who', 'shoe' and 'move', the lips are rounded and the back of the tongue is high but again, nothing actually touches, it just, the articulators just hold a shape.
单词“who”,“shoe”和“move”中的 OO 音,嘴唇张成圆形,舌头背面抬高,同样没有碰,发音器官只保持一个形状。