hydrogen refrigerated
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氢是温度最低的冷冻剂。
Hydrogen is also one of the coolest refrigerants.
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利用太空的环境，以及机械和氢和氦的冷冻系统，分4个步骤把这个最冷的仪器冷却到只有0.1开尔文。
The space environment, combined with mechanical and cryogenic refrigeration systems using hydrogen and helium, chill the coldest instruments to 0.1 kelvin in four sequential steps.
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