退化 become vestigial; degenerate; deteriorate; retrograde; devolution; retrogradation; retrogression; retroversion; regression; involution; degeneration; degenerescence; degeneracy; cataplasia; catagenesis; atresia 雞的翅膀逐漸退化, 不會在空中飛行了。 the wings of the chicken have become vestigial; it can no longer fly. 土豆種了幾年之后就會退化。 after a few years' planting, the quality of the potato crop deteriorates
毀林和森林退化的根本原因會議 meeting on the underlying causes of deforestation and forest degradation
森林砍伐和退化的根本原因全球講習班 global workshoon addressing the underlying causes of deforestation and forest degradation