/p/ and /b/ can appear in initial position (as in pin and bin) and also in final position (asin rope and robe). They are in phonemic contrast and said to form a () because theyoccur in the same environment and distinguish meaning.
A . complementary distribution
B . minimal pair
C . allophonic distribution
D . segmental phoneme
出自:伊犁师范-英语语音

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