Fruits and vegetables must be cool from field heat, before they are put into storage.

VOA: special.2009.11.30

So you need first to take the liquid helium and cool it below 53 degrees Kelvin before you can do the Joule-Thomson to cool it even further to make liquid helium.

我们首先需要,把温度江都53k一下,然后利用焦耳-汤姆孙实验,来继续冷却它。

麻省理工公开课 - 热力学与动力学课程节选

So you need first to take the liquid helium and cool it below 53 degrees Kelvin before you can do the Joule-Thomson to cool it even further to make liquid helium.

我们首先需要,把温度江都53k一下,然后利用焦耳-汤姆孙实验,来继续冷却它。

麻省理工公开课 - 热力学与动力学课程节选