名词
中文翻译：Unknown
同义词：
['voice change', 'vocal change']
例句：
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1.The teacher noticed a change in the students' voices during the test.
老师注意到考试期间学生们的声音发生了变化。
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2. The old man changed his voice to sound younger.
老人改变了他的声音，听起来更年轻了。
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3. The singer changed her voice for a different song.
歌手为了另一首歌换了声线。