名词
中文翻译：Unknown
同义词：
['1. diphthong', '2.diphthongism', '3. diphthongization']
例句：
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1. In the study of phonetics, diphthongia is a crucial concept.
在语音学研究中，音变现象是一个关键概念。
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2. The teacher explained the diphthongia in detail to the students.
老师向学生们详细解释了音变现象。
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3. Researchers have been studying the diphthongia for decades.
研究人员已经研究了几十年的音变现象。