名词
中文翻译：扬声器指向性指数
同义词：
['扬声器指向性系数，扬声器指向性指标']
例句：
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1.The speaker's voice was clear and strong, making it easy to understand the message.
演讲者的嗓音清晰有力，使得信息容易理解。
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2.The speaker's directivity index is an important factor in determining the effectiveness of a speech.
演讲者的指向性指数是决定演讲效果的重要因素。
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3. The speaker's directivity index can be measured using various techniques, such as sound level measurements and spatial analysis.
演讲者的指向性指数可以通过各种技术进行测量，如声级测量和空间分析。