你方应在交货前15天将全部货款电汇我方,这是达成这笔交易的基础。

你方应在交货前15天将全部货款电汇我方,这是达成这笔交易的基础。
【正确答案】：This transaction is done on the basis that you effect the payment covering the total value of  the goods by/ days prior to或 before) the date of shipment.