Jane Doe和John Doe指的是无名氏、姓氏不明者、某人、或医院中无人认领的尸体。可以理解为中文中的“张三、李四等”。

在法律语境中，指的是在提起诉讼时不为人所知的可能的女性/男性被告的假名。

Jane Doe：

1) a fictitious name used for a possible female defendant who is unknown at the time a complaint is filed to start a lawsuit.

2) the temporary fictitious name given to an unidentified hospitalized or dead woman.

John Doe：

1) a fictitious name used for a possible male defendant who is unknown at the time a complaint is filed to start a lawsuit.

2) the temporary fictitious name given to an unidentified hospitalized or dead man.

参考双语例句：

The patient, referred to in the indictment as "Jane Doe," knew of Mr. Weill's secret plan.

在指控中被称为“某女”的这位病人，知晓威尔先生的秘密计划。

The factors that the court would consider in granting the John Doe subpoena are similar to the considerations that the court may take into account in determining whether or not to grant a Norwich Pharmacal order (see footnote 17 on p.20).

法庭在决定是否发出没有被告人姓名 的传票时，所考虑的因素与决定是否发出 Norwich Pharmacal 法庭命令( 见第 20 页注 17)相若。

meant to retain a copy of messages on the server is the previously received message will be stored in the server to share files within a folder, so convenient to the mail before I can access elsewhere, or else you will only be able to on a computer or being received in the mail once a client software only if "Joe Smith" to "John Doe" sent a letter, and then John Doe Outlook will receive mail over, then when you use the web webmail form or another in other now access e-mail using Outlook software on the machine has not received "Joe Smith" sent the message.

在服务器上保留邮件副本的意思是代表把前面接收的邮件将保存在服务器共享文件夹内，这样子方便在别的地 方也能访问我之前的邮件，不然你将只能在一个电脑或同一个客户端软件上接收得到一次邮件而已，假如“张三”给 “李四” 发了一封信，然后李四用Outlook将 邮件接收过来，那么当你用网页webmail形式或者又在别的机子上现用Outlook软件来接这封邮件的 时候是已经收不到“张三”发的那封邮件了。

Accordingly, an officer of a corporation who executes a check on its 37 behalf "XYZ Corporation, John Doe, Assistant Vice President" would not be personally liable on that check under the law of New York absent establishing that he had not signed in such capacity.

据此，根据纽约州的法律，如果某公司的一名高级人员在代表该公司签立一张支票时，写上‚XYZ公司助理总裁张三‛，在未有确定该人员并非以该身分签署的情况下，他无须为该支票负上个人法律责任。

A Named User ID may not be of a generic nature (e.g., john.doe@Citrix.com is a unique Named User ID; whereas support@Citrix.com, user1@Citrix.com, trainer@Citrix.com, etc., are examples of generic user identifiers. teros.com

具名用户 ID 不得具 有 通 用 性 （ 例 如 ， john.doe@Citrix.com 是 具 有 唯 一 性 的 具 名 用 户 ID ， 而 support@Citrix.com、user1@Citrix.com、trainer@Citrix.com 等则属于通用用户标识。