文章从语音学的角度研究语音语调在语言交际中的作用，其形式多种多样，而且随语境的变化而变化。

The uses of the English pronunciation and intonation are important in communication and vary with different language situations as well.

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“区别特征”理论，是现代语音学的一个重要组成部分。

The theorem of the distinctive features is an important component of modern phonetics.

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语音学是一门语音的科学。

Phonetics is the science of sounds.

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