如果DITA主题已经翻译，那么新的翻译会比较当前的dita源文件和已有的基于DITA的翻译存储，这样所有旧的内容就在存储中有精确匹配。

If a DITA topic has already been translated, the new translation compares the current DITA source to an existing DITA-based translation memory; so, all old content has an exact match in the memory.

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该工具可以输出一个delta文件，内容是比较的结果。

The tool can output a delta file with the result of comparison.

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IFtVerificationPoint：它提供了诸如performtest和compare之类的方法，它使用Diff Match patch类来智能地比较预期PD f文件和实际pdf文件的内容。

IFtVerificationPoint: It provides methods such as performTest and compare, which use the Diff Match Patch classes to intelligently compare the text of the expected and actual PDF files.

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