評論
打印
Over 120 million years, the ozone layer gets thicker and prevents more and more radiation from reaching the Earth's surface.
1億2000萬年下來，臭氧層漸漸變厚，攔住更多輻射，不讓他們到達地球表面。
Without this layer,
沒這層臭氧，
life on land simply wouldn't exist.
陸地就不會有生命。
Now, shielded from radiation, life takes off.
不受輻射傷害的生命蓬勃發展，
Small mossy lumps are the first land plants.
這些小苔蘚團是最早的陸地植物。
They pump out even more oxygen.
它們釋放更多的氧，
Levels soar.
氧濃度激增。
375 million years ago, a new species lives in the water, swimming.
3億7500萬年前，水里有種東西在游泳，
It's a strange fish called a Tiktaalik.
這是名為提塔利克魚的怪魚。
It uses its neck to raise itself up.
它可以挺起脖子，
And its fins function as legs,
把鰭當成腿，
allowing it to move out of the water.
從水里走上岸。
