The article is really a difficult concept to grasp when you have no base knowledge of it.
当你没有冠词的基础知识时，冠词确实很难掌握。
They are really a difficult concept to grasp when you have no base knowledge of it.
当你没有基础知识时，冠词确实很难掌握。
The realization of an intelligent automatic color harmony system with a knowledge base is presented.
阐述了带有知识库的智能化自动色彩协调系统的实现。
The system consists of a knowledge base and three subprograms.
该系统由一个知识库和三个子程序组成。
The system consists of a knowledge base and three subprograms.
该系统由一个知识库和三个子程序组成。
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