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Backbones give them speed and power...
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Backbones give them speed and power... 脊椎使它们拥有速度和力量

The pairing of backbones with jaws was to prove a winning combination.
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The pairing of backbones with jaws was to prove a winning combination. 颌搭配脊椎是胜利的组合

These invertebrates, animals without backbones,
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These invertebrates, animals without backbones, 这些无脊椎动物

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