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单词 stand on all fours
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PBS地球-动物趣闻

But the most common definition is that once sauropodomorphs had to stand on all four legs and stopped having grasping fingers, they were officially sauropods.

但最常见的定义是, 一旦蜥脚类动物必须四足站立并且不再有抓握的手指,它们就正式成为蜥脚类动物。

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