Last week a team of researchers from Oregon State University offered a possible explanation: the thinning of the ozone layer.

上周，一队来自俄勒冈州立大学的研究人员提供了一个可能的解释：臭氧层愈来愈稀薄。

youdao

Scientists believe the sunburns are due to increasing levels of ultraviolet radiation resulting from the thinning ozone layer.

科学家们相信灼伤是因为臭氧层变薄，致使紫外线辐射等级增加而引起的。

youdao

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。

youdao

Scientists say the thinning ozone layer over the South Pole makes climate change take place more quickly than in other areas of the world.

VOA: special.2009.06.03

The thinning of the ozone layer presented risks that were widely accepted: people fear skin cancer.

ECONOMIST: Phew, the ozone layer may be saved

The hole is a thinning area in the ozone layer over Antarctica and the size of the hole varies every year depending on weather conditions.

CNN: Ozone hole grows in 2008