When a composite video signal is broadcast over the airwaves by a TV station, it happens on a specific frequency.
当电视台要把组合视频信号经由无线电波广播出去时，要先把它调制到特定频率的载波上。
When a composite video signal is broadcast over the airwaves by a TV station, it happens on a specific frequency.
当电视台要把组合视频信号经由无线电波广播出去时，要先把它调制到特定频率的载波上。
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