单词：slotted airfoil
开缝翼形
单词：slotted airfoil 相关文章
Exercise 5-1: Sounds Comparing L with T, D, and N For this exercise, concentrate on the different ways in which the air comes out of the mouth when producing each sound of L, T, D, and N. Look at the drawings included here, to see the correct positio
发表于:2018-12-27 / 阅读(99) / 评论(0)
美式英语正音训练
美式英语正音训练