名詞 degeneration:

1. the process of declining from a higher to a lower level of effective power or vitality or essential quality
   同義詞：devolution
2. the state of being degenerate in mental or moral qualities
   同義詞：degeneracy, decadence, decadency
3. passing from a more complex to a simpler biological form
   同義詞：retrogression

1. Progressive degeneration of an organ or tissue caused by loss of cells.
   供氧障礙引起的細胞退化一個器官或組織由于失去細胞而功能退化
2. The state of being degraded; degeneration.
   降低，墮落被降低的狀態(tài); 衰退

de.gen.er.a.tion

n.（名詞）
The process of degenerating.
衰退、墮落、蛻化的過程
The state of being degenerate.
衰退、墮落或蛻化的狀態(tài)
Medicine Gradual deterioration of specific tissues, cells, or organs with corresponding impairment or loss of function, caused by injury, disease, or aging.
【醫(yī)學】 變性：特定的組織、細胞或器官隨著受傷、疾病或年老而導致的相應的功能的削弱或喪失，而形成的逐漸的變質
Biology The evolutionary decline or loss of a function, characteristic, or structure in an organism or a species.
【生物學】 退化（作用）：一個生物體或物種的某種功能、特征或結構由于進化作用造成的衰退或喪失
Electronics Loss of or gain in power in an amplifier caused by unintentional negative feedback.
【電子學】 負反饋：由無意的負反饋引起的放大器中功率的喪失或獲得