英语语法分析

Hydrogen is also one of the coolest refrigerants.

氢是温度最低的冷冻剂。

And as time goes by, the use of alternative refrigerants is changing.

和推移，替代制冷剂的使用是随着时间的变化。

Others are also looking at refrigerants that don't warm the atmosphere.

也有其他人在考虑不致大气变暖的制冷剂。