氧气做的第一件事是给地球加上了一层重要的保护罩 臭氧层
It shielded the planet from lethal ultravioletradiation coming from the Sun,
它保护地球免受来自太阳的致命性紫外线辐射
allowing complex life to flourish on the surface of our planet.
使复杂生物能在地球表面繁荣生长
The concentration of ozone in the atmosphere
大气层中的臭氧层浓度
is revealed in this colour-coded image.
通过图中色码显露
It shows the massive hole over Antarctica
很明显可知南极洲有大量漏洞
created by our recent pollution.
由于近年来的污染
Fortunately, the hole is shrinking.
幸运的是漏洞在减少
But oxygen didn't only protect the planet.
但是臭氧层不止保护地球
About 600 million years ago,
大约六亿年前
it ended the long reign of the stromatolite
叠层石独占地球的历史终结
and caused a revolution in the development of life.
引起一场物种进化
This is because oxygen is highly reactive
这是因为氧气是高度活性的
and can support far more energetic forms of life than bacteria.
能支持比病菌更有活力的物种
Blessed with an oxygen-rich atmosphere, Earth became home
感谢富含氧气的大气层，地球开始适合多样性
to an extraordinary diversity of complex life.
生物居住
And ultimately, to us.
同时，最根本的，我们人类
