semivowel

例句：

1. 1.The vowels in the word "cat" are pronounced as "kæt."
   单词"cat"中的元音字母发音为"kæt."
2. 2. In English, a vowel is any letter that has no consonant sound when it's pronounced alone.
   在英语中，元音是指单独发音时没有辅音声音的字母。
3. 3. Vowels are essential for pronunciation and can help distinguish words.
   元音对于发音至关重要，可以帮助区分单词。