working fluid

基本解释

Helium may also prove crucial as a working fluid or even a fuel in future nuclear reactors.
未来，氦作为核反应堆的工质甚至燃料，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.
水中的热量转化为低温沸腾的工作流体推动涡轮机产生电力。
But there are materials that can directly convert heat into electricity without running some working fluid through a traditional generator.
而现在有种材料，无需工作流体通过传统发电机就可以直接将热能转化为电能。

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