working fluid

基本解释

Helium may also prove crucial as a working fluid or even a fuel in future nuclear reactors.
未來，氦作爲核反應堆的工質甚至燃料，也是必不可少的。
The heat from the water is transferred to a working fluid, which boils at a low temperature, which spins a turbine to create electricity.
水中的熱量轉化爲低溫沸騰的工作流躰推動渦輪機産生電力。
But there are materials that can directly convert heat into electricity without running some working fluid through a traditional generator.
而現在有種材料，無需工作流躰通過傳統發電機就可以直接將熱能轉化爲電能。

The main difference between the thermoacoustic system and Stirling's original idea is that, instead of using thermal expansion of the working fluid to push the piston, it uses powerful pulses of sound.
ECONOMIST: A more efficient way to make electricity in spacecraft
D. in fluid mechanics and aerodynamics, and had experience working with NASA and analyzing the aerodynamics of disk drives at IBM.
FORBES: Magazine Article
While Lillehei was cutting into Leslie's chest, an anesthesiologist working on Geraldine made a horrible mistake, allowing air instead of fluid into Geraldine's I.
FORBES: Brave Heart

the fluid, esp water, steam, or compressed air, that operates an engine, refrigerator, etc