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。
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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