triplicate
adjective [ before noun ] formal uk/ˈtrɪp.lɪ.kət/ us/ˈtrɪp.lə.kət/
分为完全相同三部分的;一式三份的
existing in three parts that are exactly the same
Idiom
in triplicateidiom 一式三份
When a document is prepared or written in triplicate, two exact copies of it are made also.
The application has to be completed in triplicate, with the original being kept by the bank and the copies going to the customer and the tax office. 申请书必须一式三份，原件由银行保管，复印件留给顾客和税务部门。