题目内容
[p] is a voiced bilabial stop.
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Two sounds are in free variation when they occur in the same environment and do not contrast, namely, the substitution of one for the other does not produce a different word, but merely a different pronunciation
Acoustic phonetics is concerned with the perception of speech sounds.
All syllables must have a nucleus but not all syllables contain an onset and a coda.
A basic way to determine whether a phone is a phoneme is to see if substituting one sound for another results in a change of a meaning.If it does, the two sounds then represent different phonemes
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