had

380 篇文章
the continents had shifted almost to where they are today.
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the continents had shifted almost to where they are today. 各大♥陆♥几乎漂移到了今天所在的位置

every land habitat the changing planet had to offer.
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every land habitat the changing planet had to offer. 主宰每一片陆地栖息地

form some of the largest herds the Earth had ever seen.
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form some of the largest herds the Earth had ever seen. 形成了地球史上最大的兽群

...but they had evolved jaws that could chew.
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...but they had evolved jaws that could chew. 但它们已经进化出能够咀嚼的颌部

Spiders had been around for over 100 million years...
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Spiders had been around for over 100 million years... 当时蜘蛛已经存在超过一亿年

...reptiles have had to adapt to an ever more crowded world.
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...reptiles have had to adapt to an ever more crowded world. 爬行动物 不得不适应一个越来越拥挤的世界

The mammals had lost their crown.
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The mammals had lost their crown. 哺乳动物走下王座

have had little competition or predators,
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have had little competition or predators, 几乎没有竞争对手和捕食者

the Earth's continents had been converging,
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the Earth's continents had been converging, 地球的大♥陆♥一直在汇聚

Never had their survival been so important.
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Never had their survival been so important. 其生存从未如此重要