这个音乐应用为古典音乐爱好者开设了一个专门的子频道。

The music app has a ___sub-channel specially designed for classical music lovers.

这个数字电视信号在主频道下划分了四个子频道，可以同时播放不同的节目。

The digital TV signal divides into four ___sub-channels under the main channel, allowing simultaneous broadcasts of different programs.

我们可以在游戏子频道里讨论具体的策略。

We can discuss specific strategies in the gaming ___sub-channel.