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

其次，该系统中没有氟利昂制冷工质，对环境没有污染。

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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。

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Freon will not be used as refrigerant in the future.

未来的制冷剂将不会使用氟利昂。

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Heating and cooling experts say central air-conditioning systems should be serviced annually to remove dirt, change filters and check the level of Freon, a refrigerant.

WSJ: Don't Wait to Service AC Units

That motivates companies to produce as much as possible of the ostensible product--the refrigerant HFC22, a.k.a. freon--to get at the real moneymaker, HFC23.

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