post crown

例句：

1. 1. The postal service is responsible for delivering mail and packages.
   邮政服务负责递送邮件和包裹。
2. 2. She placed a post crown on the envelope to indicate her address.
   她在信封上贴了一个邮资封来标明她的地址。
3. 3. The post crown was a symbol of the sender's identity and the importance of the message.
   邮资封是发件人身份的象征，也是信息重要性的标志。