阐述了在学会第一角投影法的基础上，如何迅速地掌握第三角投影的画图和看图方法。
The paper discusses also how to master rapidly its charting and chart reading based on the first Angle projection.
本文用对比形式扼要地阐述了第三角投影法的基本原理、特点和看图方法。
With respect to the third angle projection, this paper sets forth briefly its rationale, characteristics, and chart reading, in the form of comparison.
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