音标
中文翻译：双元音
同义词：
['double vowel', 'diphthong', 'double consonant', 'diphthong sound']
例句：
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1. She pronounced the word "cat" with a diphthong sound.
她发“cat”这个单词时，用了双元音。
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2. The teacher taught us the pronunciation of diphthongs.
老师教我们双元音的发音。
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3. In some languages, diphthongs are used to distinguish between words.
在一些语言中，双元音用于区分单词。