英语音标浊化规则 -回复
To understand English phonetic rules, it is essential to delve into the concept of voiced assimilation. Voiced assimilation refers to the process by which a voiceless consonant sound changes into a voiced sound when followed by a voiced consonant. In this article, we will explore this rule in detail, step by step, to gain a comprehensive understanding of the phenomenon.
Firstly, let us examine what voiced and voiceless consonants are. In English phonetics, consonants are classified based on whether the vocal cords vibrate (voiced) or not (voiceless) during their production. For instance, the sounds /p/, /t/, and /k/ are voiceless consonants, as the vocal cords do not vibrate when producing these sounds. Conversely, the sounds /b/, /d/, and /g/ are voiced consonants, as the vocal cords do vibrate when pronouncing these sounds.
Now that we have a basic understanding of voiced and voiceless consonants, we can explore why voicing assimilation occurs. When a voiceless consonant is followed by a voiced
consonant within a word or across word boundaries, the voiceless sound will change to a voiced sound. This assimilation process occurs because it is more efficient and natural for the vocal cords to maintain their vibration through both consonant sounds rather than vibrating for one and not for the other.
For example, let's consider the word "absence." In isolation, the "s" sound is voiceless. However, when followed by the voiced consonant "b" in the word "absence," the /s/ sound assimilates and becomes voiced, resulting in a pronunciation that sounds like /z/.
However, there are some conditions for voiced assimilation to take place. Voiced assimilation only occurs when the voiceless and voiced consonants share the same place of articulation, meaning that they are produced at the same location in the vocal tract. For instance, in the word "subway," the voiceless /s/ sound followed by the voiced /b/ sound conforms to this condition, as both sounds are produced using the same place of articulation (alveolar region).
Moreover, voiced assimilation typically occurs within a word, but it can also happen across
word boundaries in connected speech. For example, in the phrase "she sells," the voiceless /s/ sound followed by the voiced /z/ sound in "sells" experience voiced assimilation.
It is important to note that voiced assimilation is not a universal rule in English, but rather a tendency. There are instances where the voicing of the voiceless consonant does not occur. For instance, in the word "clip," the voiceless /p/ sound does not become voiced when followed by the voiced /l/ sound. However, this is an exceptional case in English phonetics.
In conclusion, voiced assimilation is a phonetic rule that governs the change of a voiceless consonant sound into a voiced sound when followed by a voiced consonant. It enhances the flow and efficiency of speech production by maintaining the vocal cord vibration consistently through consecutive consonant sounds. Although there are conditions and exceptions to this rule, understanding voiced assimilation contributes to a better grasp of English phonetics and pronunciation.正则化英语

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