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666 篇文章
wildlife populations have fallen by an average of almost 70%,
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wildlife populations have fallen by an average of almost 70%, 野生动物种群就已平均下降将近70%

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

an unbroken line of ancestry stretching back four billion years
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an unbroken line of ancestry stretching back four billion years 一条绵延40亿年的连续谱系

Food makes an excellent gift...
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Food makes an excellent gift... 食物是很好的礼物

and quickly became home to an incredible wealth of animal life.
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and quickly became home to an incredible wealth of animal life. 很快成为大批动物的家园

all that remains is an eerie silence.
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all that remains is an eerie silence. 只剩下一片诡异的寂静

the megaflood smashes an 800-kilometer-long path through the American continent,
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the megaflood smashes an 800-kilometer-long path through the American continent, 大洪水在美洲大♥陆♥上 形成了800公里长的通道

In an instant,
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In an instant, 一瞬间

In North America, the meltwater formed an enormous glacial lake
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In North America, the meltwater formed an enormous glacial lake 在北美 融水形成一个巨大的冰川湖

This is the flip side of an ice age.
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This is the flip side of an ice age. 这是冰河时代的另一面