So, it is necessary to decrease the energy consumption of water pump for higher energy efficiency of open-loop lake source heat pump system.

室外循环水泵能耗对湖库塘开式水源热泵系统的能耗存在较大的影响，应该在实际工程应用中采取措施降低循环水泵能耗。

youdao

On the one hand, the elephants' main lake, their only water source (来源), dried up.

一方面，大象的主要湖泊饮水处，也是他们唯一的水源，已经干涸了。

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Know the source of your drinking water-the river, lake, or aquifer that supplies your home.

知道你的饮用水的来源——河流，湖泊或是你家的含水土层。

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Carp were first put into the lake in the eighteen eighties as a food source.

VOA: special.2009.12.15

It is in Gondar that castles built in the 7th century overlook Lake Tana , the source of the Blue Nile .

FORBES: Connect

Thus, protecting the Kissimmee River, the primary source of water for Lake Okeechobee and the Everglades, has become a paramount goal for conservationists.

BBC: Florida��s newest wildlife refuge

None of the estimated 12, 000 barrels of oil that spilled has made it to nearby Lake Conway, a local drinking water source, Faulkner County Judge Allen Dodson told KATV Sunday said.

CNN: Arkansas AG to investigate oil pipeline leak