- Each time, more than three-quarters of all species
每一次 超过四分之三的物种 - were lost in mass extinctions.
在大规模灭绝中消失 - Ours can be a brutal planet.
我们的星球有时候很残酷 - But there was one period
但曾经有一个时期 - when Earth was stable for 100 million years.
地球保持了一亿年稳定状态 - A period which allowed one group to become the mightiest of dynasties.
这个时期 令一个物种群建立了最强大的王朝 - This was the age of dinosaurs.
那就是恐龙时代
But there was one period 但曾经有一个时期
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