1. public box for deposit of mail. 
   邮件存放的公开箱子。
2. A public container for deposit of outgoing mail. 
   邮筒为存放外寄信件而设的公用盒箱
3. Public-key algorithms let you share files, particularly e-mail correspondence, with other users. 
   公开钥匙算法让你与其他用户共享文件，特别是电子邮件通信。
4. Banks and workplaces are closed, there is no mail delivery, and public institutions in general shut down. Shops are open, however. 
   到了假日，银行和办公地点都关门，邮递也停止，公共机构一般也休息，但商店还营业。
5. Air mail or surface mail? 
   航空还是普通邮件？

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