在美国，FCC于1945年第一次分配广播电视频率。
When the FCC first allocated broadcast TV frequencies in 1945 in the United States.
饮食关于身体安康的影响远远超越了体育运动、看电视频率以及睡眠的时间。
Diet also has a greater impact than physical activity, watching TV or sleep duration.
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.
工作频率为18M到30m，不占用有线电视频道资源。
Working frequency from 18m to 30m, not take up cable channel resources.
工作频率为18M到30m，不占用有线电视频道资源。
Working frequency from 18m to 30m, not take up cable channel resources.
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