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.

youdao

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.

youdao