• vt. 复制；使加倍
• n. 副本；复制品
• adj. 复制的；二重的
• vi. 复制；重复

du-，二。-plic, 折，词源同fold, complicate. 即两折，引申义复制。

duplicate

duplicate: [15] Like its close relative double, duplicate comes ultimately from Latin duplus ‘two-fold’, a compound adjective based on Latin duo ‘two’ and an Indo-European element *plwhich denoted ‘folding’ (it is present also in English fold and ply). English acquired this in the 16th century, and its synonym duplex (based on the extended stem *plic-) in the 19th century. In Latin, duplus formed the basis of a verb duplicāre ‘make twofold, double’, from whose past participle English gets duplicate, while duplex has given us duplicity [15].
=> double, duplicity, fold, ply, two

duplicate (adj.)

mid-15c., "having two parts, double," from Latin duplicatus, past participle of duplicare "to double," from duo "two" (see two) + plicare "to fold" see ply (v.1)). Meaning "exactly corresponding, that is an exact copy of" is from 1812.

duplicate (v.)

1620s, "to double," from Latin duplicatus, past participle of duplicare (see duplicate (adj.)). Meaning "make an exact copy" is from 1640s (implied in duplicated). Related: Duplicating. The noun is first recorded 1530s.

1. Charles scored again, with an exact duplicate of his first goal.

查尔斯再次得分,与第一次破门如出一辙.

来自柯林斯例句

2. His task will be to duplicate his success overseas here at home.

他在海外取得了成功，现在的任务就是要在国内再创辉煌。

来自柯林斯例句

3. He let himself in with a duplicate key.

他用一把复制的钥匙打开门进去。

来自柯林斯例句

4. The manager asks the secretary to duplicate the document.

经理让秘书复印这份文件.

来自《简明英汉词典》

5. Your jacket's a duplicate of mine.

你的夹克跟我的一样.

来自《简明英汉词典》