许多rss提要具有一个通道对象，但是如果您希望使用任意过滤器分离提要，您就可以使用多个通道。

Many RSS feeds have one channel object, but you can have several, perhaps if you wanted to separate feeds by an arbitrary filter.

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工作人员尝试自己修理，他们先更换了气/水分离器，又换了过滤器，但是无济于事。

The crew tried replacing one device, an air/water separator, and then a filter, but nothing seemed to bring the toilet back to full operation.

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过滤器和分离器可以捕获空气中的液体或固体，因此应当配备排放阀门。

Filters and separator can capture in the air the liquid or solid, so shall be equipped with discharge valve.

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