急~~~語言學 feature addition rules

Feature addition rules: Lengthening of English consonants before voiced obstruents.

Sometimes, features are added to phonemes when they occur in a specific phonetic context. At the beginnings of words as in [pit], /p/ is aspirated. The feature of aspiration is hence added because /p / is a sound at the beginning of a word. In other phonetic contexts, the feature of aspiration is not added, such as [spit ].

Try to pronounce these: [pit ]You will notice that while saying the word 'pit', a stream of air evades your mouth, whereas when saying 'spit', your glottis starts to vibrate immediately after the pronunciation of [sp]. Hence, we may call the [p] aspirated when saying 'pit', while it is unaspirated when saying 'spit'. This distinction results from the glottis remaining open after certain occasions of a sound, namely in the case of aspirated ones.

There are a few good websites about linguistic.
http://www.uni-kassel.de/fb8/misc/lfb/html/navigation/navigate.html
http://pandora.cii.wwu.edu/vajda/ling201/test2materials/Phonology3.htm

有人翻成辨音成分增加律
在句子前後或在音節間置入無聲子音的塞音來增加辨識度
像送氣音 H