Keep your receipt as proof of purchase.

保留好你的收据，作为购物的凭证。

youdao

I can't help you without a proof of purchase.

没有购货单的话，我帮不了你。

youdao

You'd better keep the receipt as your proof of purchase.

你最好把收据收好当做是购买的证明。

youdao

You'd better keep the receipt as your proof of purchase.

你最好把收据收好当做是购买的证明。

youdao