核销单的英语翻译有以下四种供选择:1.certificateforcancellationofforeignexchangeaftererifcation(表达比较完整)2.cerificationsheet/certification(字面意思,如果不了解核销程序的客户会看不懂)3.taxrefunddocument/certificate(对出口人来说意思更准确,但有时不想让外商知道出口方能够退税)4.(foreign)exchangcontroldeclaration(从外汇管制角度说比较准确)