例如，没有哪种统计模型可以准确无误地描述你收得的所有电子邮件中的合法邮件，而标记其余的为垃圾邮件。
No statistical model, for example, can describe with perfect accuracy all the e-mails you might legitimately receive, while labeling the rest as spam.
例如，可以使用“微电子学”这个单词来标记一篇关于微电子学的文章，即使“微电子学”这个术语根本没有出现在文档本身的内容中。
For example, a paper about microelectronics could be tagged with that word — even if the term "microelectronics" does not appear in the content of the document itself.
电子标记可以起两个作用：对房间进行实际的锁定和开锁，跟踪哪些人进入该房间以及何时进入的。
The electronic badges serve two purposes: providing the method to actually lock and unlock the door and keeping track of who enters the room and when they enter the room.
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