1. usable spare parts;a usable reference book.
   合用的零件;好用的参政书
2. The teacher mentioned a few valuable reference Books.
   老师提出了几种有价值的参考书。
3. This reference book has a large circulation.
   这本参考书发行量很大。
4. A usable reference Book.
   好用的参政书
5. At the library I came across the old reference Book.
   在图书馆里我找到旧参考书。

　1个名词解释