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1800 篇文章
Now we're on track for the sixth.
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Now we're on track for the sixth. 如今我们正在走向第六次

and our story is now written on the surface of the Earth.
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and our story is now written on the surface of the Earth. 我们的故事如今已书写在地球的表面

humans had spread out of Africa to almost every continent on Earth
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humans had spread out of Africa to almost every continent on Earth 人类已从非洲 扩散到地球上几乎每一个大♥陆♥

stick together, and calmly move on.
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stick together, and calmly move on. 聚在一起 冷静前行

Their best defense is to keep an eye on the danger,
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Their best defense is to keep an eye on the danger, 它们最好的防御是警惕危险

to the very origin of life on Earth.
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to the very origin of life on Earth. 一直可以追溯到地球生命的起源

With so much food on offer,
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With so much food on offer, 这里食物丰富

On the far side, the wall was almost a kilometer high...
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On the far side, the wall was almost a kilometer high... 在远端 这堵墙有近1000米高

primates relied on their social intelligence,
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primates relied on their social intelligence, 灵长类动物依赖于社会智力

Life on the ground is more dangerous...
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Life on the ground is more dangerous... 地上的生活更危险