Many utterance-final tone sequences, such as 20, are accompanied by an increased duration of phonemes and a laxness of articulation: in 'Look at his book'. the second [u] is longer than the first. We must therefore be prepared to recognize long contours (or fixed sequences) representing combinations of various features of speech. - Harris (1951), a pag.55 […] in some languages, the duration of phonemes is longer if the word in which they are contained is shorter. The phonemes /tæb/ are longer in 'The number on this tab has to be registered' than in 'The number on this tabulating-machine has to be registered'. - Harris (1951), a pag.345
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