1.A European found a UFO and a useful book in a university.
一名欧洲人在一所大学里发现了一个不明飞行物和一本有用的书。
2.This useful book describes several approaches and provides Java code examples for a number of modern RDBMSs.
这本书非常有用，它描述了几种方法，并提供了许多新型RDBMS的Java代码示例。
3.To be sure, that's a very useful book.
确实，那是一本很用的书。
4.It's a really useful book -- I use it all the time.
这真是一本很有用的书---我一直在用它。
5.That's a useful book to people who think of literary life.
那是一本对想要从事文学生活的人有用的书。
6.Our dictionary is our most useful book.
字典是我们最有用的书。
7.A useful book was bought by Mom for me.
妈妈给我买了一本有用的书。
8.He mentioned a useful book.
他说到一本有用的书。
9.In the library he came across a very useful book he needed.
在图书馆里他偶然发现一本他需要的有用的书。
10.So why don't you buy the useful book?
那么你为什么不买下那本有用的书呢？。