边界问题应逐步加以解决，尽管没有很多办法来处理这个问题。
The border issues must be solved step by step, although there are few ways to solve the problem.
当然，一谈到这方面，就会遇到许多困难。对于这些困难，要分别轻重缓急，逐步加以解决。
You will of course find many such problems and will have to handle them in the right order of priority.
他们不仅完成许多基础性的研究工作，而且开发了一些可以实际运用的CAI系统，但是这些研究工作和CAI系统中仍旧存在着许多问题，有待CAI的工作者逐步地加以解决。
They accomplish much basic research work, and develop some practical CAI system. However there exist many problems remained in their works that should be solved by workers in CAI step by step.
他们不仅完成许多基础性的研究工作，而且开发了一些可以实际运用的CAI系统，但是这些研究工作和CAI系统中仍旧存在着许多问题，有待CAI的工作者逐步地加以解决。
They accomplish much basic research work, and develop some practical CAI system. However there exist many problems remained in their works that should be solved by workers in CAI step by step.
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