It was simple enough, in those old days, to define with approximate accuracy when a given statement ceased to be the truth and became a lie.

在过去，要近似准确地界定一个特定声明由真理变为谎言，是很简单的。

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The more we learn, the more we approximate to truth.

我们学习得越多，我们就越接近真理。

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This paper analyzes the characteristics and limitations of approximate reasoning (based on probability) and nonmonotonic reasoning (based on truth maintenance system).

不精确推理和非单调推理是人工智能中两个重要的研究方面。

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