需要重点指出的是，我们不需要知道具体的表达式。
The important claim here is basically we don't need to know the actual formulas.
知识表达是人工智能研究重点一个重要问题。
Knowledge expression is an important problem that the artificial intelligence studies.
知识表达是人工智能研究重点一个重要问题。
Knowledge expression is an important problem that the artificial intelligence studies.
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