We cannot proceed any further without receiving your thoughts with respect to the manner of payment.
我们如果不了解你们对付款方式的意见,便不能进一步检讨。
Please sign a copy of our Sales Contract No.156 enclosed here in duplicate and return to us for our file.
请会签第156号销售合同一式两份中的一份,将它寄回我方存档。