此外你也可以使用服务拦截器增加加验证支持和自定义查询的服务操作。
Additionally, you will use Service Interceptors to add validation support and Service Operations to perform custom queries.
然而，使用电子邮件的话，你的邮件信息在传输的过程中可能会被拦截，而你却一无所知。
With e-mail, however, your message could be intercepted midstream, and you might never realize it.
一旦你的邮件经过加密，就算未授权的用户拦截到信息也不能读取。
As long as your messages are encrypted, an unauthorized user that intercepts a message would not be able to actually read it.
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