. . . alibis . . . appetite . . . rather . . . Mark . . . [audio source]
The first two a’s are different in their phonetic symbols in the dictionaries from the other two, but I can’t differentiate. What’s the difference between /ӕ/ and /ɑ/?
So one is a front vowel and the other is a back vowel. They also differ in their degree of openness.
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