These streams are called sub-channels.

这些码流就被称为子频道。

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For example, if the digital TV channel is channel 53, then 53.1, 53.2 and 53.3 could be three sub-channels on that channel.

对于数字频道53来说，53.1，53.2，53.3就是它的三个子频道。

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Each broadcaster has one digital TV channel, but one channel can carry multiple sub-channels if the broadcaster chooses that option. Here's how it works.

每个广播商有一个数字频道，但只要广播商愿意，每个频道能携带多个子频道(sub - channel)。

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