Their researches on phonetics reflect the long historical vowel change from various perspectives, such as the English history, the rules of change, the reason for change, the result of change, the typical change phenomenon, etc.
他们的著作从不同的角度展示了元音历时变化这一现象，如从英语发展史上阐释元音变化这一事实；从历时变化现象中归纳变化的规则，分析变化的原因，总结变化的结果；以某特定语言中典型的元音变化现象来证实整个社会语言的变化等。
参考来源 - 英语单词中对重音位移影响元音变化的实验分析·2,447,543篇论文数据，部分数据来源于NoteExpress
The vowel change of -ae - to -i - in Latin is due to a Latin phonetic rule involving unaccented syllables in compounds.
在拉丁语中，元音- ae -变成- i -，这是在复合词中非重读音节的语音规则。
The essence of the tone modification is a phonological opposition, and the vowel change is just an attachable phonetic phenomenon.
②通过对比分析，说明变调是这一特殊音变形式的实质与音位标志，韵母的音变只是小称变调所引起的附加语音变化。
Not only did types of vowel sounds change, but some sounds simply disappeared from the general pronunciation of English.
不仅数种元音发生了变化，而且一些语音还从英语的整个发音体系中消失了。
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