duplicationn.
英 djuːplɪ'keɪʃn | 美 ,djʊplɪ'keʃən
中文n. 复制；副本；成倍
词根词源
duplication (n.)early 15c., "doubling," from Middle French duplicacion (13c.) and directly from Latin duplicationem (nominative duplicatio), noun of action from past participle stem of duplicare (see duplicate (adj.)). Meaning "repetition" is from 1580s.
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