“helium liquefier”的概念、定义、翻译、参考文献-科学参考

单词	helium liquefier
释义	helium liquefier [`hē·lē·ǝm `lik·wǝ´fī·ǝr] ^CRYOGENICS Any one of several machines which liquefy helium by causing it to undergo adiabatic expansion and to do external work.
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