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1. The two-frequency signalling system is designed to improve network performance.
双频信号传输系统旨在提高网络性能。
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2. In the new communication system, two-frequency signalling is used for secure data transmission.
在新的通信系统中，双频信号传输用于安全数据传输。
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3. The company has introduced a new version of its two-frequency signalling technology.
该公司推出了其双频信号传输技术的新版本。