種的英語翻譯：

grow; seed; species; strain
【醫(yī)】 species

族的英語翻譯：

a group of things with common features; clan; family; race; strain
【化】 alkaline earths; family; group; odd series; periodic family; sub-group
subgroup
【醫(yī)】 group; race; series; tribe

退化的英語翻譯：

degenerate; retrogress; degeneration; degradation; deterioration; obsolescence
retrogression
【醫(yī)】 catagenesis; catapiasia; cataplasis; Deg.; degeneracy; degenerate
degeneratio; degeneration; degenerescence; degradation; devolution
disvolution; involute; involution; regress; regression; retrogression
revisionary metamorphosis

學的英語翻譯：

imitate; knowledge; learn; mimic; school; study; subject of study