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Unit101 The Ozone Hole： Why over Antarctica? 臭氧空洞：为什么出现在南极洲上空?
Unit 101 The Ozone Hole: Why over Antarctica? 臭氧空洞：为什么出现在南极洲上空?
Why the ozone hole is only found in Antarctica? 为什麽臭氧破洞只在南极上空发现?
For an ozone hole to form, proper weather conditions must also exist. 对一个臭氧空洞的形成来说，必须存在适当的气象条件。
For an ozone hole to form,proper weather conditions must also exist. 对一个臭氧空洞的形成来说，必须存在适当的气象条件。
It's good news for the environment. The ozone hole is very small this year. 这对于环境来说是条大好新闻。今年臭氧空洞非常小。
If the circumpolar vortex lasts longer than usual in future years, a large ozone hole could be expected to develop above the Arctic. 如果环极涡旋在未来几年里比正常情况下持续更长时间，一个大规模的臭氧空洞就很可能在北极上空发展起来。
The ozone hole forms over Antarctica in August and September, when the temperatures are coldest. 南极上空的臭氧洞于8月至9月间天气最冷的时候形成。
At its largest this year, the ozone hole covered more than 15 million square kilometers. 今年臭氧空洞最大的时候曾达到1500万平方公里，
Prof Austin's computer simulation suggests that the Arctic ozone hole will not recover until around 2040. 奥斯丁教授的电脑模拟显示北极的臭氧洞到2040年之前也不会复原。
Antarctic ozone hole, destruction of the ozone layer is one of the most notable signs. 南极的臭氧层空洞，就是臭氧层破坏的一个最显著的标志。
If the circumpolar vortex lasts longer than usual in future years,a large ozone hole could be expected to develop above the Arctic. 如果环极涡旋在未来几年里比正常情况下持续更长时间，一个大规模的臭氧空洞就很可能在北极上空发展起来。
As much as 70 percent of the ozone above the high northern latitudes would get lost, a depletion comparable to the Antarctic ozone hole. 这时候，北半球高纬度上方有70%25的臭氧消失，流失的量相当于南极臭氧层的破洞。
TOMS has been the key instrument for monitoring ozone levels throughout the southern hemisphere since the discovery of the ozone hole in 1985. 自1985年发现臭氧空洞以来，TOMS一直都是监视南半球臭氧层的主要仪器。
In cold years an ozone hole would appear in the high northern latitudes as well, bathing cities there in cancer-causing UV radiation. 在寒冷的年份，北半球的高纬度地区也会出现臭氧层破洞，让下方的城市暴露在致癌的紫外线辐射之中。
Long before the passionate debates over cigarettes, DDT, asbestos or the ozone hole, most Americans had heard of only one environmental health controversy: fluoridation. 在人们尚未开始热烈讨论香菸、DDT、石绵和臭氧层破洞之前，大多数美国人只听过一项环境影响健康的争议：饮水加氟。
Oh, oh, the Ozone hole is back! 糟了,臭氧层的穿孔又出现了!
His strength in a crisis is an ace in the hole. 临危不惧是他的看家本领。
The government is trying to keep a low profile on this issue. 政府力图在这个问题上保持低姿态。