Therefore, there was an archive of tests to validate new features and to avoid regression problems with existing code.

因此，形成了测试档案，以测试新的功能并且避免现有代码的回归问题。

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IBC's existing Web site had some known problems and some useful features.

IBC现有的Web站点有一些已知的问题，也有一些有用的特性。

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An inversive research method was proposed through analyzing the complicated changing features of permeability of coal seam and the problems existing in actual measurement.

分析了煤层渗透率的复杂变化特点和实际测量上存在的问题，提出其反演方法。

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