名词
中文翻译：语音等级线
同义词：
['tone-grade line', 'pitch-grade line']
例句：
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1.The voice-grade line is used to determine the pitch of a note.
语音等级线用于确定音符的音高。
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2.The tone-grade line is an important tool for evaluating the quality of speech.
音调等级线是评估口语质量的重要工具。
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3.The pitch-grade line is used to measure the distance between two points on a musical scale.
音调等级线用于测量音乐音阶上两点之间的距离。