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coloring (n.)
[coloring 词源字典]
late 14c., "action of applying color," noun of action from
color
(v.). Figurative use by 1540s. Meaning "way something is colored" is early 15c.
Coloring book
is from 1931.
[coloring etymology, coloring origin, 英语词源]
[coloring 词源字典]