资料来源 : pyDict

切展线; 渐开线; 渐屈线; 渐伸线

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Evolvent \E*volv"ent\, n. [L. evolvents. -entis, unrolling, p.
   pr. of evolvere.] (Geom.)
   The involute of a curve. See {Involute}, and {Evolute}.