Gradually disappearing; imperfectly or only slightly developed. Used of an organ or other part of an animal or a plant.
Gradually disappearing; imperfectly or only slightly developed. Used of an organ or other part of an animal or a plant.
退化的逐渐消亡的；没有完全退化或进化程度微小的。用于指动物或植物的器官或其它部分