1660s, "not made better," from un- (1) "not" + past participle of improve (v.). Sense of "not developed or taken advantage of" (of land) is recorded from 1781.
实用例句
1. Taxes on unimproved land are low.
对未耕种的土地的税收很低.
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2. Clearly developing improved humans will create great social and political problems with respect to unimproved humans.
