訊號的用法和樣例：
例句
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課程包括：電力系統，90分；訊號處理，88分；系統控制，92分；電力能源系統，92分；固體電子學，88分；通訊，94分。
Curriculum included: Electric power systems, 90; Signal processing, 88; Systems and control, 92; Electric energy systems, 92; Solid-state electronics, 88; Communications, 94. -
變頻器將無線電訊號從一種頻率轉換成另一種頻率的電子裝置
An electronic device that converts one frequency of a radio signal to another.
