retrogressionn.
英 ,retrə(ʊ)'greʃ(ə)n | 美 ,rɛtrə'grɛʃən
中文n. [医] 退化；后退
词根词源
retrogression (n.)1640s, noun of action, formed on model of progression, from Latin retrogressus, past participle of retrogradi "move backward" (see retrograde).
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