N an abstract linguistic unit representing two or more phonemes when the distinction between these has been neutralized: conventionally shown by a capital letter within slashes, as /T/ for /t/ and /d/ in German Rat and Rad 原音素; 一个抽象语言单位，代表两个或多个区别被弱化的音素，通常由大写字母加斜线表示，如/T/代表德语中Rat和Rad的/t/和/d/ [phonetics]
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