envelope of a family of curves
曲线族的包络
以上为机器翻译结果，长、整句建议使用 人工翻译 。
This paper discussed an elementary solution to the envelope of a kind of family of curves of which the equation was one of the cubic equations in regard to a parameter.
本文论述曲线族的方程为关于参数的三次方程时，其包络曲线方程的初等求法。
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