这一时期最重要的发现之一就是怎样用透视图法来画画。

One of the most important discoveries during this period was how to draw things in perspective.

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本文介绍一种不受灭点远近限制的成角透视图法，并对其进行几何论证。

This paper introduces a method that we can apply it to draw angular perspective without view points, and it demonstrates this method according to the geometric principles.

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