The second chapter introduces the features and existing problems of the present textbooks in detailed and give out certain proposals and strategies for improving the textbooks.
第二章具体介绍了现行教材的特点和存在的问题，并对改进教材提出了相关的建议和策略。
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。
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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