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underdeveloped (adj.)
[underdeveloped 词源字典]
1892, in photography, from
under
+ past participle of
develop
(v.). In reference to countries or regions, recorded from 1949.
[underdeveloped etymology, underdeveloped origin, 英语词源]
undeveloped (adj.)
1736, from
un-
(1) "not" + past participle of
develop
(v.). In reference to film, it is attested from 1939.