No reference books are to be taken out of the reading room without permission.
本阅览室参考书不得私自携出。
These reference books are necessary to us.
这些参考书是我们所必需的。
Reference books may not be taken out of the reading room.
不得将参考书携出阅览室。
The library contains a large number of foreign language reference books.
图书馆有大量的外文参考书。
Whose are these reference books?
这些参考书是谁的？
Do you need any reference books?
你需要什么参考书吗？
Do you need any reference books?
你需要一些参考书吗？
Did you find the reference books about it?
你找到有关的参考书了吗？
Here a few science reference books in German.
这是几本用德语写的迷信书籍。
These reference books will answer to our needs.
这些参考书符合我们的需要。
All the reference books available are out of date.
所有找到的参考书都是过时的。
We also train them to make use of reference books.
我们还培养他们使用参考书。
The reference books were misarranged on the shelf.
这些叁考书在书架上排得不当。
These reference books are necessary to scientists.
这些参考书是科学工作者所必需的。
We should train them to make use of reference books.
我们应训练他们学会使用参考书。
The library allowed us the run of the reference books.
图书馆允许我们自由使用参考书。
I keep my reference books near my desk for convenience.
为了图方便，我把参考书放在书桌前。
The information is culled from various reference books.
这份资料是从各种参考书中摘出的。
I keep my reference books near my desk for convenience.
我把参考书放在书桌旁用著方便。
The professor mentioned a few valuable reference books.
那位教授提出了几种有价值的参考书。
He has a large number of reference books at his disposal.
他有大量的参考书可供使用。
He has a large number of reference books at his disposal.
他每天有大量的信件要回复。
Therefore, we should make use of reference books properly.
因此，我们应该正确使用参考书。
These reference books are necessary to scientific workers.
这些参考书是科学工作者所必需的。
This time, use your reference books when (it is) necessary.
如果这次有必要，你可以使用参考书。
This time, use your reference books when (it is) necessary.
如果这次有必要，你可以使用参考书。
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