4 篇文章
To the winning combination of backbone and jaws,
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To the winning combination of backbone and jaws, 在脊椎与颌的胜利组合之外

A backbone.
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A backbone. 那就是脊椎

of four limbs and a backbone
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of four limbs and a backbone 拥有四肢和一根脊椎

Volcanoes form the backbone of the longest mountain chain on our planet -
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Volcanoes form the backbone of the longest mountain chain on our planet - 火山构成了地球上最长山系的主干

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