retrogradation
/ˌrɛtroɡrə'deʃən/
n. 
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koinotropy, koivinite, kojah, koji, kojibiose, KOK, Kokand, kokanee, kokeshi, kokil,
相似单词
retroflexed, retroflexion, retrofocus, retrogasserian, retrognathia, retrogradation, retrograde, retrograde amnesia, retrogradely, retrogress,