名词
中文翻译：副频道
同义词：
['sub-channel', 'secondary channel']
例句：
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1.The subchannel is used to deliver audio signals to the main channel.
副频道用于将音频信号传输到主频道。
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2. The subchannel was designed to provide additional information about the event.
副频道旨在提供关于该事件的额外信息。
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3. The subchannel was broadcasted during the commercial break.
副频道在商业广告时间播出。