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

这个封闭循环是供水系统的一部分，“滴滴珍贵”。

youdao

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

这个封闭循环是供水系统的一部分，“滴滴珍贵”。

youdao