regradation
/ˌri:ɡrə'deiʃən/
n. 
退,后退
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melitose, melitoxin, melitracen, melitriose, Melittangium, melittephile, Melittidae, melittin, melittopalynology, melittophilae,
相似单词
Rego, regolith, regorge, regosity, regosol, regradation, regrade, regradeing, regrading, regraff,