Define the following term, giving examples for illustration:

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Define the following term, giving examples for illustration:
Allophone
这句话什么意思？

给出下面术语的定义,并举例说明:Allophone

Allophone:any of the different forms of a phoneme(eg.is an allophone of /t/in English.When /t/occurs in words like step,it is unaspirated.Bothand are allophones of the phoneme

给出下面词语的定义，并举例说明
音位变体/音素

给出下面短语的定义,并举例说明之:Allophone