如何表示好知识关系，构建领域知识模型，难度很大。
It is difficult to express the good knowledge relation and construct a field knowledge model.
在科学领域，知识是由自然界的信息构建的。
In science, knowledge is constructed with information from the natural world.
在科学领域，知识是由自然界的信息构建的。
In science, knowledge is constructed with information from the natural world.
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