名词
中文翻译：次级频道
同义词：
['sub-channel', 'secondary channel']
例句：
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1.The subchannel is a smaller version of the main channel.
次级频道是主频道的较小版本。
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2.The subchannel is used to deliver audio and video content that is not available on the main channel.
次级频道用于提供在主频道上不可用的音乐和视频内容。
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3. The subchannel was created to provide alternative content for those who were unable to access the main channel.
次级频道是为了为那些无法访问主频道的人提供替代内容而创建的。