That's the mechanism of transfer across generations

那是代间的传送机制
for some of these compounds.

对于一些化合物来说
So phasing them out was a very important thing to do.

所以要逐步淘汰它们
Lead in gasoline and paint were phased out as well.

汽油和油漆不再含铅
Chlorinated fluorocarbons that were and are responsible for

含氯的碳氟化合物以前是现在也是
diminishing the ozone layer that exists in the upper stratosphere,

平流层上部臭氧层减少的元凶
so that reducing CFCs

所以要减少氟利昂
and similar ozone-gobbling compounds has been a success story,

贪食臭氧的化合物也已显著减少
at least the rate of loss has been stabilized.

至少臭氧的减少率已经稳定
Polychlorinated biphenyl reduction,

多氯联苯也在减少
these are chemicals originally thought to be beneficial

本以为它们有益
because they acted as a refrigerant and flame retardant

因为它们可作致冷剂和阻燃剂