单词：cissoid
two celebrated problems of the higher geometry; viz., to trisect a
plane angle, and to construct two geometrical means between two given
straight lines.
cissoid的用法和样例：
词汇搭配
- cuspidal cissoid尖点蔓叶线
- acnodal cissoid孤点蔓叶线
- crunodal cissoid结点蔓叶线
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