结构推理 我们已及时收到了同贵公司订货的50吨核桃仁(walnutmeat)的第5630号售货合同。随函寄去带有我们会签的副本，请查收。
【正确答案】We have duly received your Sales Contract No． 5630 covering 50 tons walnutmeat we have booked with you． Enclosed please find the duplicate with our counter-signature．
【答案解析】