1
a duplicate of sth
He made a duplicate of the key.
他配了一把钥匙的副本。
复制品；副本；同样的事物
先理解核心含义，再看它在真实句子里的用法。
复制品；副本；同样的事物
A thing that is exactly like another; an identical copy or an extra one of the same kind.
He made a duplicate of the key.
他配了一把钥匙的副本。
与另一物相似或对应的事物；完全相同的副本
One that resembles or corresponds to another; an identical copy.
同类的额外事物
something additional of the same kind
重复的原件；在所有要点上与另一文件相同,并具有原本全部效力的文件(区别于纯粹副本)
An original instrument repeated; a document which is the same as another in all essential particulars, and differing from a mere copy in having all the validity of an original
与原件完全相符的副本
a copy that corresponds to an original exactly
I need to make a duplicate of this document before sending it out.
在寄出这份文件之前，我需要制作一份副本。
AI contextual example
Always keep a duplicate of your key in a safe place in case you lose the original.
务必把钥匙的备用件放在安全的地方，以防丢失原版。
AI contextual example
She created a duplicate of the presentation file and stored it on the cloud.
她创建了演示文稿文件的复制品，并将其存储在云上。
AI contextual example
he made a duplicate for the files
他做了一份副本归档。
WordNet
He made a duplicate of the key.
他配了一把钥匙的副本。
Please fill out the form in duplicate.
请一式两份填写这份表格。
Always keep a duplicate of important documents.
重要文件要始终保留一份副本。
Not this
I have a duplicate the key.
Use this
I have a duplicate of the key.
作为名词，“duplicate”表示“副本”，需要介词“of”引出原物，不能直接跟名词。
Not this
She gave me two duplicate.
Use this
She gave me two duplicates.
“duplicate”是可数名词，表示多个副本时需加复数词尾“-s”。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
一式两份
Please fill out the form in duplicate.
请将表格填写一式两份。
……的副本
She gave me a duplicate of the report.
她给了我报告的副本。
制作副本
Make a duplicate of the document before sending it.
发送之前，请制作一份文件副本。
完全相同的副本
This painting is an exact duplicate of the original.
这幅画是原作的完全相同的副本。
备用钥匙；副本钥匙
I gave my neighbor a duplicate key to my apartment.
我给了邻居一套我公寓的备用钥匙。
一式两份
Please fill out the form in duplicate.
请把这份表格填写一式两份。
Use duplicate naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把 duplicate 联想成 double（双份）：两次复制出完全一样的东西，就是 duplicate——一份一模一样副本。
语域：neutral 常见场景：办公/行政、法律/合同、数据/文件 名词 duplicate 表示‘副本、复制品’时是较中性的书面词，多用于行政、法律或文档说明等场合；日常口语里更常说 copy，正式与否视搭配和文体而定。
常与介词 of 连用，如 a duplicate of the key。
Dictionary facts from ECDICT, WIKTIONARY.