The most troubling of the short-lived HFCs were invented to replace chlorofluorocarbons, refrigerants that were thinning the ozone layer in the upper atmosphere, and were also a major warming agent.

其中最短命的氢氟碳化合物，被发明取代氯氟烃，制冷剂可以稀释高层空气中的臭氧层，同时也是主要的升温剂。

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The Roman layer, which is the most ancient and deepest, is occupied by the round arch, which reappears, supported by the Greek column, in the modern and upper layer of the Renaissance.

罗曼带最古老、最深层，为 半圆 穹 窿所占据，而这种 半圆 穹 窿通过希腊式圆柱，又重新出现在最上面的现代层即文艺复兴带中。

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One of the most disturbing aspects of the changes in Earth is the rate at which chemical pollutants produced by human activity are destroying the protective layer of ozone in Earth's upper atmosphere.

地球上的变化最令人烦扰的方面之一，是人类活动所产生的化学污染正在迅速破坏地球上部大气圈臭氧保护层。

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