...与直线交于两点、， 标题问题新而十分根本，触及的概念不多，圆式是参数法，但后果却出人料想，竟是闻名的蔓叶线（Cissoid）.何故从一个随便编造的复数两次圆程会引出蔓叶线？
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oblique cissoid [数] 斜蔓叶线
crunodal cissoid [数] 结点蔓叶线
acnodal cissoid [数] 孤点蔓叶线
cissoid lines 蔓叶线型
cuspidal cissoid 尖点蔓叶线
cissoid conformation 顺式构象
curtate cissoid 短幅蔓叶线
N a geometric curve whose two branches meet in a cusp at the origin and are asymptotic to a line parallel to the y-axis. Its equation is y²(2a – x)=x³ where 2a is the distance between the y-axis and this line 蔓叶线
ADJ contained between the concave sides of two intersecting curves 二曲线相交时含于其二凹入部分的 → compare sistroid
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