元音变化是由于一个音被另一个音词同化而导致。
An umlaut is caused in a sound by its assimilation to another sound.
元音变化出现在中古英语后期，大约在1400到1600年之间。
The change occurred at the end of the Middle English period, approximately 1400-1600.
使用最小对立组能够使你将一个音单独挑出，将注意力集中在小小的元音变化上。
Using minimal pairs helps you isolate a sound to really focus on the small changes in sounds between vowels.
随着中古英语的泯灭，发音突然发生了很大的变化，元音的发音变得越来越短。
Towards the end of Middle English, a sudden and distinct change in pronunciation started, with vowels being pronounced shorter and shorter.
本文根据鄂温克语派生词尾所包含的可变元音音位类型，分为六种类型，并具体讨论属于各种类型形态语音变化派生词尾的分类形式及条件。
The paper classifies the variable vowel phonetic types included in Ewenki derivational suffixes into six kinds, and discusses the classification form and condition to each type.
本文根据鄂温克语派生词尾所包含的可变元音音位类型，分为六种类型，并具体讨论属于各种类型形态语音变化派生词尾的分类形式及条件。
The paper classifies the variable vowel phonetic types included in Ewenki derivational suffixes into six kinds, and discusses the classification form and condition to each type.
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