这样，诸如尿素（蛋白质新陈代谢所留下的残余物质）和多余的磷酸盐离子等物质便从血液转移到水中。
Substances such as urea (a leftover from protein metabolism) and excess phosphate ions therefore flow from the blood to the water.
另外必须提供的微生物在与含氮如硫酸铵，氨水或尿素化合物生长介质，以及与无机磷酸盐。
Additionally the microorganisms must be supplied in the growth medium with nitrogen-containing compounds such as ammonium sulfate, ammonia, or urea, as well as with inorganic phosphates.
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