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The ozone layer is a layer of gas in the Earth’s atmosphere that absorbs ultraviolet radiation from the Sun.
臭氧层是地球大气层中的一层气体，它能够吸收来自太阳的紫外线辐射。
The molecules that make up ozone gas are made of three bonded oxygen atoms.
臭氧分子是由三个氧原子结合而成的。
Ozone forms when photons break up molecules of oxygen gas.
当光子分解氧气分子时，臭氧就形成了。
The ozone layer protects humans and animals from the harmful effects of UV radiation, including cancers.
臭氧层可以保护人类和动物免受紫外线辐射的伤害，毕竟紫外线辐射会导致癌症等疾病。
However, in the 1980s, scientists discovered a dangerously thin area in the ozone layer above Antarctica.
然而，在20世纪80年代，科学家们在南极洲上空发现了一片臭氧稀薄的危险区域。
This is commonly known as the “ozone hole”.
这就是俗称的“臭氧空洞”。
Artificial emissions of chlorine gases had destroyed many of the ozone molecules in the atmosphere.
人为排放的氯气破坏了大气中许多臭氧分子。
In 1987, a global agreement known as the Montreal Protocol banned the use of certain chemicals in order to protect the ozone layer.
1987年，《蒙特利尔议定书》在全球范围内禁止某些化学物质的使用，以保护臭氧层。
Since then, the ozone hole has been shrinking.
从那以后，臭氧空洞一直在缩小。
