很有用

1.The book is valuable for my purpose.

这本书对我很有用。

2.The computer is useful in processing data.

电子计算机在处理资料方面很有用。

3.Her lectures are very useful, but they’re dry as dust.

她讲的课很有用，可是却乏味得要死。

4.A laptop would be really useful for when I’m working on the train.

我在火车工作时, 便携式电脑真的很有用。

5.It pays to advertise.

登广告很有用。

6.The distinctives of Reformed theology and practice are useful only to the degree that they undergird and clarify the gospel, the evangel.

革宗神学与实践的特点是很有用的，但也只在一个程度，即加强并澄清福音与福音要点。

7.For example, Digital's Lectrice file format included a pre-rendered bitmap representation of each page to allow for quick page turns, a prerequisite for the thumbing navigation metaphor.

要回忆起停止阅读或者阅读一次引用的地方，这种感受就变得很有用了。