vowel

In English, vowel sounds are produced with an open vocal tract.

用法提示：“vowel”作为形容词修饰“sounds”，表示“元音的”。

The vowel shift in Middle English changed the pronunciation of many words.

用法提示：“vowel”作为形容词修饰“shift”，表示“元音的”。

Children often struggle to distinguish between different vowel sounds.

用法提示：“vowel”作为形容词修饰“sounds”，表示“元音的”。