为了使二次曲线的作图更简便，文章以第二笛沙格定理和对合定理为基础，提出了一种新的作图方法。
Based on the Second Desargues Theory and involution theory, a simple drawing method for a conic is presented.
为了使二次曲线的作图更简便，文章以第二笛沙格定理和对合定理为基础，提出了一种新的作图方法。
Based on the Second Desargues Theory and involution theory, a simple drawing method for a conic is presented.
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