这些特点都给注水开发工作带来了困难，油田在注水开发过程当中遇到很多矛盾。

These characteristics brought a lot of difficulties and contradiction to the work of water flooding development.

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在软件开发过程当中，传统的开发模式的一个缺点就是他能够呈现较少的改变甚至没有改变。

In software development, one of the weaknesses of the classic waterfall approach is that it assumes little or no change.

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