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.
但是这份报告哀叹道：当前有数不胜数的交易及收获中的野生产品严重缺乏监督，结果导致生物栖息地退化，物种资源衰竭。
But the report laments that far too much of the harvesting of, and trade in, wild products is poorly supervised, with the result that habitats are degraded and stocks depleted.
跟退化结构相似的概念还有返祖现象，它的意思是生物体身上重新出现直系祖先没有的结构或特征。
Similar in concept to vestigial structures are atavisms, which are the reappearance of a structure or trait that isn't found in the immediate ancestors.
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