单词	cryogen
释义	cryogen /ˈkrʌɪə(ʊ)dʒ(ə)n / noun A substance used to produce very low temperatures.The first cryogens were liquid air and compressed carbon dioxide snow.... After all, a superconductor that is both easy to process and can be cooled using electrical refrigerators, rather than messy cryogens, would find many applications. They also recommended that a prototype using hydrogen as a combined cryogen and form of energy transport be designed, built and tested at one of the national laboratories.
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