1·Certified milk; certified check; certified mail.
合格牛奶；保付支票；保证邮件。
2·Send your roommate the notice via certified mail.
通过具有证明文件的电子邮件，通知室友。
3·You have to sign for it when you receive a certified mail.
您收到挂号信的时候要签收。
4·Certified mail protocol is fair exchange of a message m for a receipt.
认证邮件协议，指一个发送方要将消息M与收方收到的证据进行交换的协议。
5·Otherwise, the written decision shall be sent to the employee's home via overnight or certified mail.
不然的话，这份书面决定应以快递或挂号邮件送达该员工的家。
6·Send off your correspondence by certified mail, return receipt requested so you can document when the credit reporting agency received your letter.
欢送你的认证邮件函授、所以你可以请回文件时收到的信用报告机构收到你的来信。
7·If you don't get a response within about 10 days, call the representative to let them know you're waiting for a response, and send another letter by certified mail with return receipt requested.
如果你在10天内没有得到答复，给代表打电话告诉他们你在等答复，寄另外一封有需求收据的保证邮件。
8·The actual meaning of the digital signature should be understood as: "a person who claims to have such and such E-mail address certified this file, and it hasn't changed since then."
数字签名的实际意义应该被理解为：“声称有某某电子邮件地址的人证明了他有这个文件，并且此后此文件未被更改过。”
9·All notices, requests and other communications to any party hereunder shall be in writing and either delivered personally, telecopied or sent by certified or registered mail, postage prepaid.
通知协议各方的所有通知、要求或联系均应以书面形式通过个人递送、传真递送或邮资预付的挂号信方式递送。