and

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And he needs a mate.
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And he needs a mate. 而他需要配偶

and there are no predators to worry him.
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and there are no predators to worry him. 也没有天敌前来叨扰

This is a male, and life here suits him well.
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This is a male, and life here suits him well. 这是一只雄性树懒 在这里生活得十分惬意

and reveal the extreme lengths animals go to to survive.
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and reveal the extreme lengths animals go to to survive. 去揭秘动物们为了生存 突破的种种极限

Never have those wildernesses been as fragile and as precious as they are today.
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Never have those wildernesses been as fragile and as precious as they are today. 大自然从未像现在一样 脆弱而又珍贵

and reveal new wildlife dramas for the very first time.
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and reveal new wildlife dramas for the very first time. 首次揭示野生动物的精彩瞬间

it's impossible not to be impressed by the sheer grandeur,splendour and power of the natural world.
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it's impossible not to be impressed by the sheer grandeur,splendour and power of the natural world. 让人无法不为自然界的力量 与其纯粹的宏伟壮丽 而叹为观止

And since then, much has changed.
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And since then, much has changed. 时至今日 世界已大有变化

Once and not so long ago
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Once and not so long ago 曾经在不久以前

They take many tons of water into their ballooning throats in a single gulp and sieve out what it contains.
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They take many tons of water into their ballooning throats in a single gulp and sieve out what it contains. 它们一口可吃进几吨的海水 然后再过滤出想要的东西