One solution is to define document equivalence in terms of a model that includes all document features, after which application-dependent definitions of equivalence can be specified by applying document equivalence to application-specific transformations of the documents to be compared.
It's much easier to access the data stored in the database than those stored in the file. 是学软件... 你说这些词英文版教材上都有，看四年英文版教材... 应该不会错吧而且一楼明显是机器翻译，都不是一个句子，连谓语动词都没有……
