C. The entire system of membrane treatment and daily water quality maintenance.

整个系统的预膜处理和日常水质维护。

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This intricate web of interactions is vital to the maintenance of our soil, air, and water quality.

这个复杂的交互的网络对于我们的土地，空气和水的质量的维持是致命的。

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The advantages of the equipment include water quality stabilization, simplex operation, low operation cost, easy maintenance and so on.

系统采用全自动控制，该设备具有产水水质稳定、操作简便、运行费用低、维护方便等优点。

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Overall, each of the six ecosystem processes examined which included the maintenance of stability and improved water quality worked better when there were more species than when there were fewer.

ECONOMIST: Marine biodiversity