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frequency channel
channel现在有4个～。There are at present four television channels./科教～ channel for science and education/戏曲～ channel for operas /2～ channel 2
英汉词典共收录311570条英汉翻译词条，基本覆盖所有常用英文单词的例句及中文翻译，是不可多得的英语学习材料。