退化器官以各种方式明显地揭示了它们的起源和意义。

Rudimentary organs plainly declare their origin and meaning in various ways.

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这个领域的专家们认为第三根手指很可能是我们祖先爪子的一个退化器官，并把平衡需求列为最主要的原因。

Experts in this field hold that the longer third finger is most likely a vestige of our ancestors' PAWS, and state the need for balance as the primary reason for its length.

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由于这些结构的出现可以追溯到各代祖先，所以它们可以作为进化的标志；没有一个生物体身上的退化器官是祖先没有的。

Because these structures can be traced back through the ancestors, they essentially serve as a marker of evolution; no organism can have a vestigial organ that hasn't been found in its forefathers.

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