degradationn.
英 ,degrə'deɪʃ(ə)n | 美 ,dɛɡrə'deʃən
中文n. 退化；降格，降级；堕落
词根词源
degradation (n.)1530s, from French dégradation (14c., Old French degradacion), from Medieval Latin degradationem (nominative degradatio), noun of action from past participle stem of degradare (see degrade).
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