名词
中文翻译：多频率键控
同义词：
['multiple frequency keying', 'multiple-frequency keying']
例句：
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1. The newsystem uses multifrequency keying to ensure secure communication.
新系统使用多频率键控来确保通信安全。
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2. In this project, we need to implement multifrequency keying to improve the network performance.
在这个项目中，我们需要实现多频率键控来提高网络性能。
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3. Multifrequency keying is a technology that can enhance the security of wireless communication.
多频率键控是一种可以增强无线通信安全性的技术。