vestigial
01
退化的, 残留的
(of body parts) not as developed as it used to be in earlier relatives
例子
Whales have tiny vestigial hind legs buried deep in their bodies, remnants of when their ancient ancestors lived on land.
鲸鱼体内深处埋有微小的退化后腿，这是它们远古祖先生活在陆地上时的遗迹。
The human appendix is often cited as a vestigial structure since it performs no clearly essential function for health and survival.
人类的阑尾常被引用为退化结构，因为它对健康和生存没有明显的重要功能。
