标准美国口语有许多声调的变化，这些声调表达了所说一切内容带有的情绪和感情。
The standard American dialect involves a variety of pitch changes that reflect a mood and feeling about everything that's being said.
标准美国口语有许多声调的变化，这些声调表达了所说一切内容带有的情绪和感情。
The standard American dialect involves a variety of pitch changes that reflect a mood and feeling about everything that's being said.
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