a triplicate copy of sth
多用于合同、票据等正式文书，指同一份文件共三份中的一份。
Keep a triplicate copy of the receipt for your records.
请保留一份收据的三联副本存档。
三倍的；三重的；三倍增加的；三联的
threefold; tripled
三倍的；三重的；三倍增加的
Made thrice as much; threefold; tripled.
This new printer uses a triplicate amount of ink compared with the old model.
与旧型号相比，这台新打印机消耗的墨水是其三倍。
用法提示：triplicate 作形容词修饰 amount，表示“三倍的”。
The community garden produced a triplicate harvest this year thanks to the rain.
得益于雨水，社区菜园今年的收成是往年的三倍。
用法提示：triplicate 作形容词修饰 harvest，表示“三倍的、三重的”。
He earns a triplicate salary after taking on the extra night shift.
他承担额外的夜班后，挣的工资是原来的三倍。
用法提示：triplicate 作形容词修饰 salary，意为“三倍的”。
多用于合同、票据等正式文书，指同一份文件共三份中的一份。
Keep a triplicate copy of the receipt for your records.
请保留一份收据的三联副本存档。
后接复数名词，强调每一份文件都备有三份。
All triplicate forms must be signed by both parties.
所有一式三份的表格都必须由双方签字。
set 本身含“一套”之意，triplicate sets 指每一套都由三份组成。
The clerk prepared triplicate sets of the customs papers.
办事员准备了好几套一式三份的海关文件。
grammar · medium
易错句子Please hand in the report in triplicates.
正确表达Please hand in the report in triplicate.
in triplicate 是固定的介词短语，意为“一式三份”，其中 triplicate 固定用单数，不加 -s，也不加冠词；汉语说“三份”，学习者容易顺着数量概念把词尾变成复数。
grammar · medium
易错句子The agreement was signed by triplicate.
正确表达The agreement was signed in triplicate.
表示“以一式三份的方式”时，固定搭配是 in triplicate，介词只能用 in，不能用 by 或 on；汉语“以……方式”直译时容易选错介词。
triple 除形容词外还可作动词（使增至三倍）和名词（三倍量）；triplicate 只作形容词，表示“三倍的/三重的”。句中需要动词或名词时只能用 triple。
threefold 在此义上表示“三倍（地）”，可作形容词和副词；triplicate 只作形容词。需要副词“三倍地”时用 threefold，不能用 triplicate。
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