I enclose my receipt as proof of purchase.

【purchase】我附上收据作为我的购物凭证。

However, Cindy is cutting out the UPC code as a proof of purchase, evidence that she bought this thing.

然而， Cindy 正在剪下 UPC 代码作为购买证明，证明她购买了这个东西。

So you have to send a form – send a piece of paper to the company with a copy of your receipt or some other what we would call " proof of purchase, " meaning evidence that you bought something.

因此， 您必须发送一份表格——将一张纸连同您的收据副本或其他我们称之为“购买证明” 的东西一起发送给公司，这意味着您购买了东西的证据。