复印书和正版书一样好，但它们的成本并不高，通常不到一半的价格。
Copied books are as good as copyrighted ones, but they don't cost much, usually less than half the price.
这种方法使得确定丢失的文件或修正版本极为困难。
This approach makes it difficult to determine missing files or correct versions.
第一个版本的修正版，它访问EJB来得到其产品目录信息。
A modification of the first version that accesses an EJB for its product-category information.
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