这个封闭循环是供水系统的一部分，“滴滴珍贵”。

This closed loop is part of a water-supply system in which "every drop counts".

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这将产生一个封闭的水系统。

This will create a closed water system.

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通过在任何住宅水系统上安装一个防回流阀，可以形成一个无法适应热膨胀的封闭系统。

By installing a backflow preventer on any residential water system, you create a closed system that won't accommodate thermal expansion.

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