return receipt的用法和樣例：
例句
用作動詞 (v.)
- For a service by mail, the date of acceptance marked on the receipt of the mail is the date of service.
郵寄送達的，以回執上註明的收件日期為送達日期。 - A non-delivery receipt that is sent to an e-mail sender when a message cannot be delivered to the intended recipient temporarily or permanently.
暫時或永久性地無法將郵件傳遞到目標收件人時發送給電子郵件發件人的未送達回執。
