虽然这个功能很有用，但你可能会觉得它很烦。
While this is auseful feature, some of you might find it irritating.
如果想在流上执行两个操作，每个操作需要不同且不兼容的过滤器，那么这个功能很有用。
This could be useful if you want to perform two operations on the stream, each requiring different and incompatible filters.
这个功能在下面这种情况下很有用：您想在一个目录中更改一个程序或配置文件，然后在另一个目录下的日志文件中查看结果。
This functionality could be useful if you wanted to change a program or configuration file in one directory and see the results in a log file in a different directory.
有时，向某个程序添加相关功能是很有用的，即使这个功能并不是用来完成完全相同的任务。
Sometimes, it's very useful to add related functionality to a program, even when it's not quite the same task.
这个功能对数据仓库应用程序很有用。
This feature is very useful for data warehouse applications.
如果想通过用户最近阅读的100篇文章分析其趋势或者实现对它们的查询，那么这个功能就很有用了。
You might want to analyze the last 100 items a user has read to pull out trends or enable complete search and this function may therefore be useful.
这个Merlin发行版中新添加的许多功能（比如异常处理和日志记录功能），并不象其它一些功能一样显著或令人兴奋，但它们很有用，值得我们关注。
Many of the features new to the Merlin release, like exception handling and logging, aren't as visible or exciting as some others, but they are useful and merit our attention.
这个模型在iPhone或iPod设备上是很有用的，因为按钮选项卡可以提供一系列应用程序快捷键来访问应用程序功能。
This model is useful for an iPhone or iPod device, where a button tab provides a series of shortcuts to reach application functions.
只有您愿意，当然可以创建一个纯粹的GUI程序，但如果没有让人感兴趣的功能的话，这个程序也许不会很有用。
You can create a pure GUI if you want, but it probably isn't too useful without some underlying software that does something interesting.
所以这个功能不是必须的，但是我们觉得你会发现它很有用，而且很好用。
So it's not something you have to use, but we think you'll find it useful and easy to use.
真实硬件的行为通常是很难控制它重复同一个行为动作的同一个动作硬件，但这个功能往往对驱动程序调试很有用。
The behavior of real device is usually difficult to control to reoccur some cases. But this capability is required in driver debugging.
对于任何类型的交叉表或基于表格的数据输入，尤其是当您需要使用有自动重算功能的公式时，这个控件也是很有用的。
This control is also useful for any kind of cross-tabulated or grid-based data entry, especially when you need to use formulas with automatic recalculation.
这个功能对那些有很多联系人，且不想花很长时间挨个设定个性铃声的用户很有用。
This is especially useful for those with very long contact list and don't want to spend hours specifying a ringtone for each.
这个功能在处理多个任务并且没有打开新会话时候很有用。
This is very useful for doing many tasks at the same time without opening new sessions.
这个功能在处理多个任务并且没有打开新会话时候很有用。
This is very useful for doing many tasks at the same time without opening new sessions.
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