adj.残留的，退化的，残余的

The human tailbone is a vestigial structure, no longer serving any functional purpose in our anatomy.
人类尾椎是残留结构，在我们的解剖学中已不再有任何功能。
The whale's hind limbs, though present, are vestigial and useless for swimming.
鲸鱼的后肢虽然存在，但对游泳来说是无用的残留物。
The wings of penguins are vestigial remnants from their ancestors who once flew.
鸟类学家认为，企鹅的翅膀是它们飞行祖先遗留下来的痕迹。
The appendix is a vestigial organ that some scientists believe had a role in the digestive system in our distant past.
盲肠被认为是人体内的一个残留器官，有些科学家认为它在远古时期在消化系统中扮演过角色。
The teeth of mammals that evolved to be herbivorous often have vestigial carnivorous features.
转为食草的哺乳动物牙齿常常保留着一些原始的肉食性特征。
The thylacine, a now extinct marsupial, had vestigial claws on its front feet.
已灭绝的袋狼在其前脚上有着退化的爪子。
Some facial muscles in humans, like the muscles used for winking, are vestigial and not essential for survival.
人类的一些面部肌肉，如眨眼肌，是残留的，对生存并不关键。
The阑尾's function in the human body is largely vestigial, as it was more useful for our ancestors with simpler digestive systems.
在人类体内，阑尾的作用很大程度上是残留的，因为它对我们祖先那种更简单的消化系统更有用。
The human ear has a small vestigial structure called the auditory tube, which connects the middle ear to the back of the throat.
人的耳朵有一个小的残留结构——听觉管，连接中耳和喉咙后部。
The fossil record shows how some animals evolved to lose vestigial features over time, adapting to their new environments.
化石记录显示，有些动物是如何随着时间的推移逐渐失去残留特征，以适应新环境的。