名词
中文翻译：语音拨号
同义词：
['voice frequency', 'dial tone']
例句：
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1. The phone system is voice-frequency dialing, so it's important to know how to use itcorrectly.
电话系统是语音拨号的，所以正确使用它非常重要。
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2. The customer service representative was able to dial the correct voice frequency for the product.
客户服务代表能够正确地拨出该产品的正确语音频率。
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3. The engineer used a dial tone to test the connection between the two devices.
工程师使用了调频来测试两个设备之间的连接。