最好你们能多提供一些交易资料，比如原厂发票啊，交易往来函电、信用证、国内销售单据什么的，总之资料越齐越好。
zuì hǎo nǐmen néng duō tígōng yīxiē jiāoyì zīliào ，bǐrú yuánchǎng fāpiào ā ，jiāoyì wǎnglái hándiàn 、xìnyòng zhèng 、guónèi xiāoshòu dānjù shénme de ，zǒngzhī zīliào yuè qí yuè hǎo 。
It's best that you provide information on transactions, like receipts from the original factory, correspondence on transactions, letters of credit, sales receipts from China, the more complete the information the better.