1. 对合：大的篇幅.在德扎格创用的所有术语中,也只有对合(involution)这个词沿用下来.德扎格的对台定义是这样的:圆锥曲线问题是德扎格研究的一个重要课题.古希腊数学家阿波罗尼奥斯的圆锥曲线论(Conics)对圆锥曲线问题作了完整的总结,

noun

1. the action of enfolding something

Synonym: enfolding

2. the process of raising a quantity to some assigned power

Synonym: exponentiation

3. the act of sharing in the activities of a group

e.g. the teacher tried to increase his students' engagement in class activities

Synonym: engagementparticipationinvolvement

4. marked by elaborately complex detail

Synonym: elaboratenesselaborationintricacy

5. a long and intricate and complicated grammatical construction

6. reduction in size of an organ or part (as in the return of the uterus to normal size after childbirth)