The relatively short [ A ] of mat and the relatively long [ A ] of mad are allophones.
单词mat中较短的 [ A ] 和 单词 mad中较长的A是音素的变形.
《现代英汉综合大词典》
The relatively short ( ? ) of mat and the relatively long ( ? ) of mad are allophones.
mat 中较短的? 和mad中的较长的? 是语音变体.
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