All theories should be built on a foundation of factual knowledge.
所有的理论都应建立在事实的基础上。
Factual knowledge about the world could then be taught at a later age.
事实了解世界然后可以在以后的学习年龄。
The text is free of factual errors, to the best of my knowledge.
就我所知，这篇课文中没有事实性错误。
The text is free of factual errors, to the best of my knowledge.
就我所知，这篇课文中没有事实性错误。
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