Internal flush joints are most common, offering no restriction to fluid flow.

内平式接头最为普遍，它对流体的流动没有限制。

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It is then recycled into "gray" water, which is used to flush toilets before being taken out of the internal water system as "black" water.

然后被循环为“灰”水，用来冲马桶，最后最为“黑”水离开内部水系统。

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It is then recycled into "gray" water, which is used to flush toilets before being taken out of the internal water system as "black" water.

然后被循环为“灰”水，用来冲马桶，最后最为“黑”水离开内部水系统。

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