A difference report can help you decide whether a given set of code changes is covered well enough by existing tests or requires that new tests be written.
差异报告通过已存在的测试，或者要求书写新的测试，来决定是否给出一系列的代码变更集合。
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The paper introduced the process of upgrading the I/O IMAGE system, the difference between different editions and the set-up of code device.