vestigial
🇺🇸
/veˈstɪdʒiəl/
🇬🇧
/veˈstɪdʒiəl/
adjective
R
something small and remaining from something larger that was once there
The tiny tail on a human embryo is a vestigial part that we don't need anymore.
人類胚胎上的小尾巴是我們不再需要的退化部分。
translation
殘存的