其次，该系统中没有氟利昂制冷工质，对环境没有污染。

What's more, there is no Freon refrigerant in the new system and no pollution effect.

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科学家表示，如果淘汰氟利昂制冷剂能按照进度达成，到2000年时大气层应能开始自我修复。

If the CFC phaseout proceeds on schedule, the atmosphere should start repairing itself by the year 2000, say scientists.

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介绍了表面增强型蒸发强化管，并对氟利昂制冷工质R22在该管外的沸腾换热进行了实验研究。

The experimental study on the performance of nucleate boiling of R22 outside the surface enhanced evaporation tubes was conducted by use of four two-sides enhanced tubes with different geometries.

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And so, by and large, until this freon was invented by Midgley, there wasn't a good gas that had the right properties to be used for a refrigerant.

因此，总的说来，直到Midgley发明氟利昂，没有一个气体,能被很好的用作制冷剂。

麻省理工公开课 - 固态化学导论课程节选