When there is no information for a page or query yet, a helpful message telling the user how to start could go in that empty space.
当一个页面没有信息时或是有疑问时，在界面上空的地方放置一句有帮助的信息提示来告诉用户怎么开始将是有益的。
Although sending messages to a log file can be quite useful, there are often times when you would also like to display a user-friendly error message in the event of an unrecoverable exception.
虽然向一个日志文件发送消息相当有用，但是很多时候您可能还想在发生不可恢复的异常时显示一个用户友好的错误消息。
If there is more than one login for a user in the sysusers table, you see an output message in the results file and it lists all the logins that have the same username.
如果sysusers表中的某一用户有多个登录，您将在结果文件中看到一则输出消息，它会列出具有相同用户名的所有登录。
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