恶化 worsen; deteriorate; take a turn for the worse;exacerbate 使事情恶化 aggravate a matter; 两国关系恶化到今天这个地步, 是令人痛心的。 it is saddening to see that relations between the two countries should have deteriorated to the present state. 病人的病情恶化了。 the patient took a turn for the worse. 形势恶化了。 the situation worsened
退化 become vestigial; degenerate; deteriorate; retrograde; devolution; retrogradation; retrogression; retroversion; regression; involution; degeneration; degenerescence; degeneracy; cataplasia; catagenesis; atresia 鸡的翅膀逐渐退化, 不会在空中飞行了。 the wings of the chicken have become vestigial; it can no longer fly. 土豆种了几年之后就会退化。 after a few years' planting, the quality of the potato crop deteriorates