The Ozone Hole的意思|示意

Scientists use "hole" as a metaphor for the area in which ozone concentrations drop below the historical threshold of 220 Dobson Units.

科学家们用“空洞”一词表示臭氧浓度低于220个多布森单位（多布森单位是用来度量大气中臭氧柱尺度的单位。

The size and shape of the ozone hole is shown in 2009.

这幅图片上的阴影显示的是2009年的臭氧层空洞。

We reversed our first man-made global atmospheric crisis by banning chlorofluorocarbons -- by 2015, the Antarctic ozone hole will have shrunk by nearly 400, 000 square miles.

我们通过禁止含氯氟烃安然度过了第一次人为的全球大气危机——到2015年，南极臭氧空洞的面积将缩小近400,000平方英里。

The image shows the extent, or geographic area, of the ozone hole at its widest on September 12, 2011, when it stretched 10.05 million square miles (26.03 million square kilometers).

这幅图片显示，在今年9月12日臭氧空洞达到其最大宽度时所覆盖的范围和地理区域。当时其面积为1千零5万平方英里(2千6百零3万平方公里)。

The left image shows high ozone concentrations over most of the planet, but very low concentrations—the ozone hole—over the Arctic.

作图显示了地球上大部分地区都被高浓度的臭氧所覆盖，但在北极上空却有一片极低值区——也就是臭氧洞。

However, even slight changes in the meteorology of the region this month could affect the rate of depletion of ozone and how large an area the ozone hole might span.

即使这一地区在本月之内出现任何的天气变化都有可能影响臭氧含量的变动，并决定臭氧空洞将扩大多少。