vestigial
adj. 痕迹的；遗迹的；退化的
副词：vestigially
近义词：stunted，remaining，shrunken，imperceptible，token，useless，degenerate，atrophic，undeveloped，rudimentary，
英英释义
Adjective
- not fully developed in mature animals;
"rudimentary wings"
例句
用作形容词(adj.)
- The wings of the chicken have become vestigial; it can no longer fly.鸡的翅膀逐渐退化，不会在空中飞行了。