购买凭证
先理解核心含义，再看它在真实句子里的用法。
购买凭证
a document that shows that something was bought
Keep your proof of purchase in case you need to return the item.
保留你的购买凭证,以防需要退货。
购买凭证
a document that shows that something was bought
Use proof of purchase naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
Dictionary facts from AI_SUPPLEMENT.