传统的恒温器不够好，但是19世纪发明的Dewar flask一次能保持像液态氮这样的温度在- 1960华氏摄氏度的低温液体好几个月之久。

A conventional thermos isn't good enough, but a Dewar flask, invented in the 19th century, holds cryogenic fluids like liquid nitrogen at temperatures of -196oc (-321of) for months at a time.

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由此产生的冷冰的气态氮被注入发动机汽缸（见图）。与此同时，乙二醇与水的混合物也注入其中，这种混合物是一种常温环境下的“传热液体”。

The resultant cold, gaseous nitrogen is now injected into the engine's cylinder (see diagram) along with a mixture of water and glycol, known as a heat-transfer liquid, that is at room temperature.

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氩、氦、氢、氮和氧是在低温以液体状态运输、操作和储存的最常用的工业气体。

The most commonly used industrial gases that are transported, handled, and stored in the liquid state at cryogenic temperatures are argon, helium, hydrogen, nitrogen, and oxygen.

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