| 词汇 | unknown |
| 词根词缀 | 词源： unknown (adj.) c.1300, "strange, unfamiliar" (of persons, places), from un- (1) "not" + pp. of know. Cf. O.E. ungecnawen. In ref. to facts, attested from early 14c. The noun meaning "unknown person" is recorded from 1590s. |
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