adj.四倍的;
n.四组中的一个,一式四份的文件;
例句:
We are sending you our blank proforma invoice in quadruplicate.
兹寄上空白形式发票一式四份.
Please fill out this form in quadruplicate.
请把这个表格填四份.
Please send us as soon as possible your program invoice, in quadruplicate.
请尽快将形式发票一式四份寄来.