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附寻B的内容估计现在联机数据库的数量超过了400个。其数量几乎每天都在变化,在我们准备这本书的手稿时列出所有可用的数据库是不恰当的,因为在手稿被铅印并装订成书的时候,这一情报已经可时了。但这里我们可以
Attachment B estimates that the number of online databases now exceeds 400. The numbers are changing almost daily, and it is not appropriate to list all the available databases when we prepare the manuscripts for this book, as the information is already there when the manuscript is printed and bound into a book. But here we can